812237131247 has 4 divisors (see below), whose sum is σ = 816086596536. Its totient is φ = 808387665960.

The previous prime is 812237131177. The next prime is 812237131259. The reversal of 812237131247 is 742131732218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812237131247 - 2¹⁶ = 812237065711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812237131847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1924732328 + ... + 1924732749.

It is an arithmetic number, because the mean of its divisors is an integer number (204021649134).

Almost surely, 2^812237131247 is an apocalyptic number.

812237131247 is a deficient number, since it is larger than the sum of its proper divisors (3849465289).

812237131247 is a wasteful number, since it uses less digits than its factorization.

812237131247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849465288.

The product of its digits is 112896, while the sum is 41.

The spelling of 812237131247 in words is "eight hundred twelve billion, two hundred thirty-seven million, one hundred thirty-one thousand, two hundred forty-seven".