11912531 has 2 divisors, whose sum is σ = 11912532. Its totient is φ = 11912530.

The previous prime is 11912503. The next prime is 11912569. The reversal of 11912531 is 13521911.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11912531 is a prime.

It is a super-2 number, since 2×11912531² = 283816789651922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 11912497 and 11912506.

It is not a weakly prime, because it can be changed into another prime (11912581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5956265 + 5956266.

It is an arithmetic number, because the mean of its divisors is an integer number (5956266).

Almost surely, 2^11912531 is an apocalyptic number.

11912531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11912531 is an equidigital number, since it uses as much as digits as its factorization.

11912531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 11912531 is about 3451.4534619490. The cubic root of 11912531 is about 228.3852302991.

The spelling of 11912531 in words is "eleven million, nine hundred twelve thousand, five hundred thirty-one".