811379551 has 4 divisors (see below), whose sum is σ = 822807504. Its totient is φ = 799951600.

The previous prime is 811379521. The next prime is 811379593. The reversal of 811379551 is 155973118.

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 811379551 - 2¹¹ = 811377503 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811379521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5713870 + ... + 5714011.

It is an arithmetic number, because the mean of its divisors is an integer number (205701876).

Almost surely, 2^811379551 is an apocalyptic number.

811379551 is a deficient number, since it is larger than the sum of its proper divisors (11427953).

811379551 is a wasteful number, since it uses less digits than its factorization.

811379551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11427952.

The product of its digits is 37800, while the sum is 40.

The square root of 811379551 is about 28484.7248714113. The cubic root of 811379551 is about 932.6986597424.

The spelling of 811379551 in words is "eight hundred eleven million, three hundred seventy-nine thousand, five hundred fifty-one".