97999971 has 4 divisors (see below), whose sum is σ = 130666632. Its totient is φ = 65333312.

The previous prime is 97999949. The next prime is 98000027. The reversal of 97999971 is 17999979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17999979 = 3 ⋅5999993.

It is a cyclic number.

It is not a de Polignac number, because 97999971 - 2⁹ = 97999459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97999171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16333326 + ... + 16333331.

It is an arithmetic number, because the mean of its divisors is an integer number (32666658).

Almost surely, 2^97999971 is an apocalyptic number.

97999971 is a deficient number, since it is larger than the sum of its proper divisors (32666661).

97999971 is a wasteful number, since it uses less digits than its factorization.

97999971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32666660.

The product of its digits is 2893401, while the sum is 60.

The square root of 97999971 is about 9899.4934718904. The cubic root of 97999971 is about 461.0435837287.

The spelling of 97999971 in words is "ninety-seven million, nine hundred ninety-nine thousand, nine hundred seventy-one".