99971625 has 32 divisors (see below), whose sum is σ = 179157888. Its totient is φ = 49214400.

The previous prime is 99971609. The next prime is 99971633. The reversal of 99971625 is 52617999.

It is not a de Polignac number, because 99971625 - 2⁴ = 99971609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5379 + ... + 15128.

It is an arithmetic number, because the mean of its divisors is an integer number (5598684).

Almost surely, 2^99971625 is an apocalyptic number.

It is an amenable number.

99971625 is a deficient number, since it is larger than the sum of its proper divisors (79186263).

99971625 is a wasteful number, since it uses less digits than its factorization.

99971625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20538 (or 20528 counting only the distinct ones).

The product of its digits is 306180, while the sum is 48.

The square root of 99971625 is about 9998.5811493431. The cubic root of 99971625 is about 464.1149775139.

The spelling of 99971625 in words is "ninety-nine million, nine hundred seventy-one thousand, six hundred twenty-five".