812988115991 has 2 divisors, whose sum is σ = 812988115992. Its totient is φ = 812988115990.

The previous prime is 812988115981. The next prime is 812988116093. The reversal of 812988115991 is 199511889218.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812988115991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812988115921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406494057995 + 406494057996.

It is an arithmetic number, because the mean of its divisors is an integer number (406494057996).

Almost surely, 2^812988115991 is an apocalyptic number.

812988115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

812988115991 is an equidigital number, since it uses as much as digits as its factorization.

812988115991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 62.

The spelling of 812988115991 in words is "eight hundred twelve billion, nine hundred eighty-eight million, one hundred fifteen thousand, nine hundred ninety-one".