8311640531 has 2 divisors, whose sum is σ = 8311640532. Its totient is φ = 8311640530.

The previous prime is 8311640509. The next prime is 8311640549. The reversal of 8311640531 is 1350461138.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8311640531 is a prime.

It is a super-2 number, since 2×8311640531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8311640551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4155820265 + 4155820266.

It is an arithmetic number, because the mean of its divisors is an integer number (4155820266).

Almost surely, 2^8311640531 is an apocalyptic number.

8311640531 is a deficient number, since it is larger than the sum of its proper divisors (1).

8311640531 is an equidigital number, since it uses as much as digits as its factorization.

8311640531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 8311640531 is about 91168.1991211848. The cubic root of 8311640531 is about 2025.6399364253.

The spelling of 8311640531 in words is "eight billion, three hundred eleven million, six hundred forty thousand, five hundred thirty-one".