990764431 has 2 divisors, whose sum is σ = 990764432. Its totient is φ = 990764430.

The previous prime is 990764413. The next prime is 990764461. The reversal of 990764431 is 134467099.

Together with previous prime (990764413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990764431 - 2¹⁵ = 990731663 is a prime.

It is a super-2 number, since 2×990764431² = 1963228315469507522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990764461) 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, 495382215 + 495382216.

It is an arithmetic number, because the mean of its divisors is an integer number (495382216).

Almost surely, 2^990764431 is an apocalyptic number.

990764431 is a deficient number, since it is larger than the sum of its proper divisors (1).

990764431 is an equidigital number, since it uses as much as digits as its factorization.

990764431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 990764431 is about 31476.4107070676. The cubic root of 990764431 is about 996.9119507679.

The spelling of 990764431 in words is "nine hundred ninety million, seven hundred sixty-four thousand, four hundred thirty-one".