97921531 has 8 divisors (see below), whose sum is σ = 99729728. Its totient is φ = 96120000.

The previous prime is 97921517. The next prime is 97921559. The reversal of 97921531 is 13512979.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97921531 is a prime.

It is a super-2 number, since 2×97921531² = 19177252466767922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97921561) 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, 35326 + ... + 37996.

It is an arithmetic number, because the mean of its divisors is an integer number (12466216).

Almost surely, 2^97921531 is an apocalyptic number.

97921531 is a deficient number, since it is larger than the sum of its proper divisors (1808197).

97921531 is a wasteful number, since it uses less digits than its factorization.

97921531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333.

The product of its digits is 17010, while the sum is 37.

The square root of 97921531 is about 9895.5308599387. The cubic root of 97921531 is about 460.9205431763.

The spelling of 97921531 in words is "ninety-seven million, nine hundred twenty-one thousand, five hundred thirty-one".