999623431 has 2 divisors, whose sum is σ = 999623432. Its totient is φ = 999623430.

The previous prime is 999623399. The next prime is 999623441. The reversal of 999623431 is 134326999.

999623431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999623431 - 2⁵ = 999623399 is a prime.

It is a super-2 number, since 2×999623431² = 1998494007608423522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999623441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499811715 + 499811716.

It is an arithmetic number, because the mean of its divisors is an integer number (499811716).

Almost surely, 2^999623431 is an apocalyptic number.

999623431 is a deficient number, since it is larger than the sum of its proper divisors (1).

999623431 is an equidigital number, since it uses as much as digits as its factorization.

999623431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 999623431 is about 31616.8219623668. The cubic root of 999623431 is about 999.8744612407.

The spelling of 999623431 in words is "nine hundred ninety-nine million, six hundred twenty-three thousand, four hundred thirty-one".