99431564 has 6 divisors (see below), whose sum is σ = 174005244. Its totient is φ = 49715780.

The previous prime is 99431561. The next prime is 99431567. The reversal of 99431564 is 46513499.

It is an interprime number because it is at equal distance from previous prime (99431561) and next prime (99431567).

It is not an unprimeable number, because it can be changed into a prime (99431561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12428942 + ... + 12428949.

It is an arithmetic number, because the mean of its divisors is an integer number (29000874).

Almost surely, 2^99431564 is an apocalyptic number.

It is an amenable number.

99431564 is a deficient number, since it is larger than the sum of its proper divisors (74573680).

99431564 is a wasteful number, since it uses less digits than its factorization.

99431564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24857895 (or 24857893 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 99431564 is about 9971.5376948593. The cubic root of 99431564 is about 463.2777295844.

The spelling of 99431564 in words is "ninety-nine million, four hundred thirty-one thousand, five hundred sixty-four".