99657971 has 8 divisors (see below), whose sum is σ = 113983584. Its totient is φ = 85354560.

The previous prime is 99657931. The next prime is 99657979. The reversal of 99657971 is 17975699.

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-99657971 is a prime.

It is a super-2 number, since 2×99657971² = 19863422367673682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99657979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5561 + ... + 15173.

It is an arithmetic number, because the mean of its divisors is an integer number (14247948).

Almost surely, 2^99657971 is an apocalyptic number.

99657971 is a deficient number, since it is larger than the sum of its proper divisors (14325613).

99657971 is a wasteful number, since it uses less digits than its factorization.

99657971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101.

The product of its digits is 1071630, while the sum is 53.

The square root of 99657971 is about 9982.8839019594. The cubic root of 99657971 is about 463.6290928933.

The spelling of 99657971 in words is "ninety-nine million, six hundred fifty-seven thousand, nine hundred seventy-one".