9999023431 has 2 divisors, whose sum is σ = 9999023432. Its totient is φ = 9999023430.

The previous prime is 9999023401. The next prime is 9999023459. The reversal of 9999023431 is 1343209999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999023431 - 2²⁷ = 9864805703 is a prime.

It is a super-2 number, since 2×9999023431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999023401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999511715 + 4999511716.

It is an arithmetic number, because the mean of its divisors is an integer number (4999511716).

Almost surely, 2^9999023431 is an apocalyptic number.

9999023431 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999023431 is an equidigital number, since it uses as much as digits as its factorization.

9999023431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 49.

The square root of 9999023431 is about 99995.1170357833. The cubic root of 9999023431 is about 2154.3645559444.

The spelling of 9999023431 in words is "nine billion, nine hundred ninety-nine million, twenty-three thousand, four hundred thirty-one".