11811326531 has 2 divisors, whose sum is σ = 11811326532. Its totient is φ = 11811326530.

The previous prime is 11811326491. The next prime is 11811326539. The reversal of 11811326531 is 13562311811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11811326531 is a prime.

It is a super-2 number, since 2×11811326531² (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 (11811326539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905663265 + 5905663266.

It is an arithmetic number, because the mean of its divisors is an integer number (5905663266).

Almost surely, 2^11811326531 is an apocalyptic number.

11811326531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811326531 is an equidigital number, since it uses as much as digits as its factorization.

11811326531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The spelling of 11811326531 in words is "eleven billion, eight hundred eleven million, three hundred twenty-six thousand, five hundred thirty-one".