11812971931 has 2 divisors, whose sum is σ = 11812971932. Its totient is φ = 11812971930.

The previous prime is 11812971913. The next prime is 11812971967. The reversal of 11812971931 is 13917921811.

It is a happy number.

Together with previous prime (11812971913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11812971931 - 2⁵ = 11812971899 is a prime.

It is a super-2 number, since 2×11812971931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11812911931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5906485965 + 5906485966.

It is an arithmetic number, because the mean of its divisors is an integer number (5906485966).

Almost surely, 2^11812971931 is an apocalyptic number.

11812971931 is a deficient number, since it is larger than the sum of its proper divisors (1).

11812971931 is an equidigital number, since it uses as much as digits as its factorization.

11812971931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 43.

The spelling of 11812971931 in words is "eleven billion, eight hundred twelve million, nine hundred seventy-one thousand, nine hundred thirty-one".