99765431 has 4 divisors (see below), whose sum is σ = 102461832. Its totient is φ = 97069032.

The previous prime is 99765427. The next prime is 99765473. The reversal of 99765431 is 13456799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99765431 - 2² = 99765427 is a prime.

It is a super-2 number, since 2×99765431² = 19906282445231522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99735431) 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, 1348145 + ... + 1348218.

It is an arithmetic number, because the mean of its divisors is an integer number (25615458).

Almost surely, 2^99765431 is an apocalyptic number.

99765431 is a deficient number, since it is larger than the sum of its proper divisors (2696401).

99765431 is a wasteful number, since it uses less digits than its factorization.

99765431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696400.

The product of its digits is 204120, while the sum is 44.

The square root of 99765431 is about 9988.2646640946. The cubic root of 99765431 is about 463.7956749379.

The spelling of 99765431 in words is "ninety-nine million, seven hundred sixty-five thousand, four hundred thirty-one".