990040631 has 2 divisors, whose sum is σ = 990040632. Its totient is φ = 990040630.

The previous prime is 990040627. The next prime is 990040637. The reversal of 990040631 is 136040099.

990040631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990040631 - 2² = 990040627 is a prime.

It is a super-2 number, since 2×990040631² = 1960360902061756322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990040637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495020315 + 495020316.

It is an arithmetic number, because the mean of its divisors is an integer number (495020316).

Almost surely, 2^990040631 is an apocalyptic number.

990040631 is a deficient number, since it is larger than the sum of its proper divisors (1).

990040631 is an equidigital number, since it uses as much as digits as its factorization.

990040631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 990040631 is about 31464.9111074543. The cubic root of 990040631 is about 996.6691279430.

The spelling of 990040631 in words is "nine hundred ninety million, forty thousand, six hundred thirty-one".