999930731 has 2 divisors, whose sum is σ = 999930732. Its totient is φ = 999930730.

The previous prime is 999930709. The next prime is 999930739. The reversal of 999930731 is 137039999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999930731 - 2²⁶ = 932821867 is a prime.

It is a super-2 number, since 2×999930731² = 1999722933596388722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999930731.

It is not a weakly prime, because it can be changed into another prime (999930739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499965365 + 499965366.

It is an arithmetic number, because the mean of its divisors is an integer number (499965366).

Almost surely, 2^999930731 is an apocalyptic number.

999930731 is a deficient number, since it is larger than the sum of its proper divisors (1).

999930731 is an equidigital number, since it uses as much as digits as its factorization.

999930731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 999930731 is about 31621.6813436604. The cubic root of 999930731 is about 999.9769098002.

The spelling of 999930731 in words is "nine hundred ninety-nine million, nine hundred thirty thousand, seven hundred thirty-one".