813745057 has 4 divisors (see below), whose sum is σ = 813802176. Its totient is φ = 813687940.

The previous prime is 813745027. The next prime is 813745061. The reversal of 813745057 is 750547318.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 813745057 - 2⁷ = 813744929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813745027) 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, 12228 + ... + 42154.

It is an arithmetic number, because the mean of its divisors is an integer number (203450544).

Almost surely, 2^813745057 is an apocalyptic number.

It is an amenable number.

813745057 is a deficient number, since it is larger than the sum of its proper divisors (57119).

813745057 is a wasteful number, since it uses less digits than its factorization.

813745057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57118.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 813745057 is about 28526.2170117245. The cubic root of 813745057 is about 933.6041807338.

The spelling of 813745057 in words is "eight hundred thirteen million, seven hundred forty-five thousand, fifty-seven".