990459457331 has 2 divisors, whose sum is σ = 990459457332. Its totient is φ = 990459457330.

The previous prime is 990459457327. The next prime is 990459457483. The reversal of 990459457331 is 133754954099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990459457331 - 2² = 990459457327 is a prime.

It is a super-2 number, since 2×990459457331² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990459457531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495229728665 + 495229728666.

It is an arithmetic number, because the mean of its divisors is an integer number (495229728666).

Almost surely, 2^990459457331 is an apocalyptic number.

990459457331 is a deficient number, since it is larger than the sum of its proper divisors (1).

990459457331 is an equidigital number, since it uses as much as digits as its factorization.

990459457331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18370800, while the sum is 59.

The spelling of 990459457331 in words is "nine hundred ninety billion, four hundred fifty-nine million, four hundred fifty-seven thousand, three hundred thirty-one".