97973981 has 12 divisors (see below), whose sum is σ = 117648000. Its totient is φ = 81267480.

The previous prime is 97973963. The next prime is 97973999. The reversal of 97973981 is 18937979.

It is an interprime number because it is at equal distance from previous prime (97973963) and next prime (97973999).

It is not a de Polignac number, because 97973981 - 2²² = 93779677 is a prime.

It is a super-2 number, since 2×97973981² = 19197801905976722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97978981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30731 + ... + 33768.

It is an arithmetic number, because the mean of its divisors is an integer number (9804000).

Almost surely, 2^97973981 is an apocalyptic number.

It is an amenable number.

97973981 is a deficient number, since it is larger than the sum of its proper divisors (19674019).

97973981 is a wasteful number, since it uses less digits than its factorization.

97973981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64544 (or 64537 counting only the distinct ones).

The product of its digits is 857304, while the sum is 53.

The square root of 97973981 is about 9898.1806914200. The cubic root of 97973981 is about 461.0028232331.

The spelling of 97973981 in words is "ninety-seven million, nine hundred seventy-three thousand, nine hundred eighty-one".