811925137 has 4 divisors (see below), whose sum is σ = 825686640. Its totient is φ = 798163636.

The previous prime is 811925131. The next prime is 811925159. The reversal of 811925137 is 731529118.

811925137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811925137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811925096 and 811925105.

It is not an unprimeable number, because it can be changed into a prime (811925131) 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, 6880663 + ... + 6880780.

It is an arithmetic number, because the mean of its divisors is an integer number (206421660).

Almost surely, 2^811925137 is an apocalyptic number.

It is an amenable number.

811925137 is a deficient number, since it is larger than the sum of its proper divisors (13761503).

811925137 is a wasteful number, since it uses less digits than its factorization.

811925137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761502.

The product of its digits is 15120, while the sum is 37.

The square root of 811925137 is about 28494.3000791386. The cubic root of 811925137 is about 932.9076672760.

The spelling of 811925137 in words is "eight hundred eleven million, nine hundred twenty-five thousand, one hundred thirty-seven".