11518574531 has 2 divisors, whose sum is σ = 11518574532. Its totient is φ = 11518574530.

The previous prime is 11518574521. The next prime is 11518574567. The reversal of 11518574531 is 13547581511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11518574531 - 2¹⁸ = 11518312387 is a prime.

It is a super-2 number, since 2×11518574531² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (11518574521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5759287265 + 5759287266.

It is an arithmetic number, because the mean of its divisors is an integer number (5759287266).

Almost surely, 2^11518574531 is an apocalyptic number.

11518574531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11518574531 is an equidigital number, since it uses as much as digits as its factorization.

11518574531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 41.

The spelling of 11518574531 in words is "eleven billion, five hundred eighteen million, five hundred seventy-four thousand, five hundred thirty-one".