97985021 has 4 divisors (see below), whose sum is σ = 99447552. Its totient is φ = 96522492.

The previous prime is 97985011. The next prime is 97985023. The reversal of 97985021 is 12058979.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12058979 = 2999 ⋅4021.

It is a cyclic number.

It is not a de Polignac number, because 97985021 - 2¹⁰ = 97983997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97985021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97985023) 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 3 ways as a sum of consecutive naturals, for example, 731165 + ... + 731298.

It is an arithmetic number, because the mean of its divisors is an integer number (24861888).

Almost surely, 2^97985021 is an apocalyptic number.

It is an amenable number.

97985021 is a deficient number, since it is larger than the sum of its proper divisors (1462531).

97985021 is a wasteful number, since it uses less digits than its factorization.

97985021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462530.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 97985021 is about 9898.7383539520. The cubic root of 97985021 is about 461.0201383065.

The spelling of 97985021 in words is "ninety-seven million, nine hundred eighty-five thousand, twenty-one".