11997461831 has 2 divisors, whose sum is σ = 11997461832. Its totient is φ = 11997461830.

The previous prime is 11997461809. The next prime is 11997461873. The reversal of 11997461831 is 13816479911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11997461831 - 2⁶ = 11997461767 is a prime.

It is a super-2 number, since 2×11997461831² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11997461831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11997461881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5998730915 + 5998730916.

It is an arithmetic number, because the mean of its divisors is an integer number (5998730916).

Almost surely, 2^11997461831 is an apocalyptic number.

11997461831 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997461831 is an equidigital number, since it uses as much as digits as its factorization.

11997461831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 50.

The spelling of 11997461831 in words is "eleven billion, nine hundred ninety-seven million, four hundred sixty-one thousand, eight hundred thirty-one".