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97979797 = 7397101137
BaseRepresentation
bin1011101011100…
…00110110010101
320211100220000101
411311300312111
5200040323142
613420014101
72266546246
oct565606625
9224326011
1097979797
1150341743
1228991331
13173b7116
14d026ccd
1589060b7
hex5d70d95

97979797 has 16 divisors (see below), whose sum is σ = 102079152. Its totient is φ = 94003200.

The previous prime is 97979771. The next prime is 97979801. The reversal of 97979797 is 79797979.

It can be written as a sum of positive squares in 8 ways, for example, as 11229201 + 86750596 = 3351^2 + 9314^2 .

It is a cyclic number.

It is not a de Polignac number, because 97979797 - 223 = 89591189 is a prime.

It is a super-2 number, since 2×979797972 = 19200081240322418, which contains 22 as substring.

It is a Duffinian number.

97979797 is an undulating number in base 10.

97979797 is a modest number, since divided by 979797 gives 97 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97970797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715113 + ... + 715249.

It is an arithmetic number, because the mean of its divisors is an integer number (6379947).

Almost surely, 297979797 is an apocalyptic number.

97979797 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

97979797 is a deficient number, since it is larger than the sum of its proper divisors (4099355).

97979797 is a wasteful number, since it uses less digits than its factorization.

97979797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its digits is 15752961, while the sum is 64.

The square root of 97979797 is about 9898.4744784234. The cubic root of 97979797 is about 461.0119451767.

The spelling of 97979797 in words is "ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-seven".

Divisors: 1 73 97 101 137 7081 7373 9797 10001 13289 13837 715181 970097 1010101 1342189 97979797