813131239867 has 4 divisors (see below), whose sum is σ = 814470830656. Its totient is φ = 811791649080.

The previous prime is 813131239861. The next prime is 813131239891. The reversal of 813131239867 is 768932131318.

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 813131239867 - 2³⁹ = 263375425979 is a prime.

It is a super-2 number, since 2×813131239867² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813131239861) 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, 669794484 + ... + 669795697.

It is an arithmetic number, because the mean of its divisors is an integer number (203617707664).

Almost surely, 2^813131239867 is an apocalyptic number.

813131239867 is a deficient number, since it is larger than the sum of its proper divisors (1339590789).

813131239867 is a wasteful number, since it uses less digits than its factorization.

813131239867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339590788.

The product of its digits is 1306368, while the sum is 52.

The spelling of 813131239867 in words is "eight hundred thirteen billion, one hundred thirty-one million, two hundred thirty-nine thousand, eight hundred sixty-seven".