97665921 has 12 divisors (see below), whose sum is σ = 142185472. Its totient is φ = 64597176.

The previous prime is 97665917. The next prime is 97665923. The reversal of 97665921 is 12956679.

It is a happy number.

It is not a de Polignac number, because 97665921 - 2² = 97665917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97665923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41581 + ... + 43866.

Almost surely, 2^97665921 is an apocalyptic number.

It is an amenable number.

97665921 is a deficient number, since it is larger than the sum of its proper divisors (44519551).

97665921 is a wasteful number, since it uses less digits than its factorization.

97665921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85580 (or 85577 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 97665921 is about 9882.6069941084. The cubic root of 97665921 is about 460.5191382229.

The spelling of 97665921 in words is "ninety-seven million, six hundred sixty-five thousand, nine hundred twenty-one".