99431597 has 2 divisors, whose sum is σ = 99431598. Its totient is φ = 99431596.

The previous prime is 99431573. The next prime is 99431611. The reversal of 99431597 is 79513499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60668521 + 38763076 = 7789^2 + 6226^2 .

It is a cyclic number.

It is not a de Polignac number, because 99431597 - 2⁸ = 99431341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99431567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49715798 + 49715799.

It is an arithmetic number, because the mean of its divisors is an integer number (49715799).

Almost surely, 2^99431597 is an apocalyptic number.

It is an amenable number.

99431597 is a deficient number, since it is larger than the sum of its proper divisors (1).

99431597 is an equidigital number, since it uses as much as digits as its factorization.

99431597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 47.

The square root of 99431597 is about 9971.5393495689. The cubic root of 99431597 is about 463.2777808363.

The spelling of 99431597 in words is "ninety-nine million, four hundred thirty-one thousand, five hundred ninety-seven".