813811877 has 2 divisors, whose sum is σ = 813811878. Its totient is φ = 813811876.

The previous prime is 813811849. The next prime is 813811883. The reversal of 813811877 is 778118318.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 734084836 + 79727041 = 27094^2 + 8929^2 .

It is a cyclic number.

It is not a de Polignac number, because 813811877 - 2¹⁶ = 813746341 is a prime.

It is a super-2 number, since 2×813811877² = 1324579542292526258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813811847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406905938 + 406905939.

It is an arithmetic number, because the mean of its divisors is an integer number (406905939).

Almost surely, 2^813811877 is an apocalyptic number.

It is an amenable number.

813811877 is a deficient number, since it is larger than the sum of its proper divisors (1).

813811877 is an equidigital number, since it uses as much as digits as its factorization.

813811877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 44.

The square root of 813811877 is about 28527.3881909999. The cubic root of 813811877 is about 933.6297340785.

The spelling of 813811877 in words is "eight hundred thirteen million, eight hundred eleven thousand, eight hundred seventy-seven".