1155990631 has 2 divisors, whose sum is σ = 1155990632. Its totient is φ = 1155990630.

The previous prime is 1155990623. The next prime is 1155990653. The reversal of 1155990631 is 1360995511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155990631 - 2³ = 1155990623 is a prime.

It is a super-2 number, since 2×1155990631² = 2672628677919556322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155990601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577995315 + 577995316.

It is an arithmetic number, because the mean of its divisors is an integer number (577995316).

Almost surely, 2^1155990631 is an apocalyptic number.

1155990631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155990631 is an equidigital number, since it uses as much as digits as its factorization.

1155990631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 1155990631 is about 33999.8622203091. The cubic root of 1155990631 is about 1049.5056269829.

The spelling of 1155990631 in words is "one billion, one hundred fifty-five million, nine hundred ninety thousand, six hundred thirty-one".