813565249 has 4 divisors (see below), whose sum is σ = 929788864. Its totient is φ = 697341636.

The previous prime is 813565229. The next prime is 813565273. The reversal of 813565249 is 942565318.

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 813565249 - 2¹³ = 813557057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813565229) 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, 58111797 + ... + 58111810.

It is an arithmetic number, because the mean of its divisors is an integer number (232447216).

Almost surely, 2^813565249 is an apocalyptic number.

It is an amenable number.

813565249 is a deficient number, since it is larger than the sum of its proper divisors (116223615).

813565249 is a wasteful number, since it uses less digits than its factorization.

813565249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116223614.

The product of its digits is 259200, while the sum is 43.

The square root of 813565249 is about 28523.0652104573. The cubic root of 813565249 is about 933.5354115024.

The spelling of 813565249 in words is "eight hundred thirteen million, five hundred sixty-five thousand, two hundred forty-nine".