9990872831 has 2 divisors, whose sum is σ = 9990872832. Its totient is φ = 9990872830.

The previous prime is 9990872819. The next prime is 9990872869. The reversal of 9990872831 is 1382780999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9990872831 - 2³⁰ = 8917131007 is a prime.

It is a super-2 number, since 2×9990872831² (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 (9990872891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995436415 + 4995436416.

It is an arithmetic number, because the mean of its divisors is an integer number (4995436416).

Almost surely, 2^9990872831 is an apocalyptic number.

9990872831 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990872831 is an equidigital number, since it uses as much as digits as its factorization.

9990872831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 9990872831 is about 99954.3537370934. The cubic root of 9990872831 is about 2153.7790275295.

The spelling of 9990872831 in words is "nine billion, nine hundred ninety million, eight hundred seventy-two thousand, eight hundred thirty-one".