813811379 has 4 divisors (see below), whose sum is σ = 814031184. Its totient is φ = 813591576.

The previous prime is 813811357. The next prime is 813811381. The reversal of 813811379 is 973118318.

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 813811379 - 2¹⁶ = 813745843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813811399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104252 + ... + 111785.

It is an arithmetic number, because the mean of its divisors is an integer number (203507796).

Almost surely, 2^813811379 is an apocalyptic number.

813811379 is a deficient number, since it is larger than the sum of its proper divisors (219805).

813811379 is a wasteful number, since it uses less digits than its factorization.

813811379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219804.

The product of its digits is 36288, while the sum is 41.

The square root of 813811379 is about 28527.3794625444. The cubic root of 813811379 is about 933.6295436382.

The spelling of 813811379 in words is "eight hundred thirteen million, eight hundred eleven thousand, three hundred seventy-nine".