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99609161 = 1132813137
BaseRepresentation
bin1011110111111…
…10101001001001
320221102200002012
411323332221021
5200444443121
613514545305
72316443501
oct573765111
9227380065
1099609161
1151254923
1229438235
1317837942
14d32ca01
158b28c5b
hex5efea49

99609161 has 8 divisors (see below), whose sum is σ = 100880424. Its totient is φ = 98344960.

The previous prime is 99609151. The next prime is 99609163. The reversal of 99609161 is 16190699.

It can be written as a sum of positive squares in 4 ways, for example, as 25563136 + 74046025 = 5056^2 + 8605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(99609161) divides (99609161-1)5.

It is a cyclic number.

It is not a de Polignac number, because 99609161 - 210 = 99608137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99609163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30185 + ... + 33321.

It is an arithmetic number, because the mean of its divisors is an integer number (12610053).

Almost surely, 299609161 is an apocalyptic number.

It is an amenable number.

99609161 is a deficient number, since it is larger than the sum of its proper divisors (1271263).

99609161 is a wasteful number, since it uses less digits than its factorization.

99609161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 99609161 is about 9980.4389182039. The cubic root of 99609161 is about 463.5533891930.

The spelling of 99609161 in words is "ninety-nine million, six hundred nine thousand, one hundred sixty-one".

Divisors: 1 113 281 3137 31753 354481 881497 99609161