813253393 has 4 divisors (see below), whose sum is σ = 820854000. Its totient is φ = 805652788.

The previous prime is 813253379. The next prime is 813253417. The reversal of 813253393 is 393352318.

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 not a de Polignac number, because 813253393 - 2²⁵ = 779698961 is a prime.

It is a super-2 number, since 2×813253393² = 1322762162452024898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813253373) 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, 3800143 + ... + 3800356.

It is an arithmetic number, because the mean of its divisors is an integer number (205213500).

Almost surely, 2^813253393 is an apocalyptic number.

It is an amenable number.

813253393 is a deficient number, since it is larger than the sum of its proper divisors (7600607).

813253393 is a wasteful number, since it uses less digits than its factorization.

813253393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7600606.

The product of its digits is 58320, while the sum is 37.

The square root of 813253393 is about 28517.5979528431. The cubic root of 813253393 is about 933.4161152623.

The spelling of 813253393 in words is "eight hundred thirteen million, two hundred fifty-three thousand, three hundred ninety-three".