1165645631 has 2 divisors, whose sum is σ = 1165645632. Its totient is φ = 1165645630.

The previous prime is 1165645627. The next prime is 1165645717. The reversal of 1165645631 is 1365465611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165645631 - 2² = 1165645627 is a prime.

It is a super-2 number, since 2×1165645631² = 2717459474138776322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165645031) 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, 582822815 + 582822816.

It is an arithmetic number, because the mean of its divisors is an integer number (582822816).

Almost surely, 2^1165645631 is an apocalyptic number.

1165645631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165645631 is an equidigital number, since it uses as much as digits as its factorization.

1165645631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 1165645631 is about 34141.5528498632. The cubic root of 1165645631 is about 1052.4194038596.

The spelling of 1165645631 in words is "one billion, one hundred sixty-five million, six hundred forty-five thousand, six hundred thirty-one".