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97909021 = 719996997
BaseRepresentation
bin1011101010111…
…11100100011101
320211020021221001
411311133210131
5200031042041
613414310301
72266133020
oct565374435
9224207831
1097909021
11502a3551
1228958391
1317390b42
14d0091b7
1588e0131
hex5d5f91d

97909021 has 8 divisors (see below), whose sum is σ = 111968000. Its totient is φ = 83868048.

The previous prime is 97909013. The next prime is 97909027. The reversal of 97909021 is 12090979.

97909021 is a nontrivial binomial coefficient, being equal to C(13994, 2).

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

It is a cyclic number.

It is not a de Polignac number, because 97909021 - 23 = 97909013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97909027) 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, 10495 + ... + 17491.

It is an arithmetic number, because the mean of its divisors is an integer number (13996000).

Almost surely, 297909021 is an apocalyptic number.

97909021 is the 13993-rd triangular number and also the 6997-th hexagonal number.

97909021 is the 4665-th centered nonagonal number.

It is an amenable number.

97909021 is a deficient number, since it is larger than the sum of its proper divisors (14058979).

97909021 is a wasteful number, since it uses less digits than its factorization.

97909021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9003.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 97909021 is about 9894.8987362176. The cubic root of 97909021 is about 460.9009139844.

The spelling of 97909021 in words is "ninety-seven million, nine hundred nine thousand, twenty-one".

Divisors: 1 7 1999 6997 13993 48979 13987003 97909021