813890569 has 4 divisors (see below), whose sum is σ = 815648896. Its totient is φ = 812132244.

The previous prime is 813890551. The next prime is 813890579. The reversal of 813890569 is 965098318.

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 an emirpimes, since its reverse is a distinct semiprime: 965098318 = 2 ⋅482549159.

It is a cyclic number.

It is not a de Polignac number, because 813890569 - 2¹¹ = 813888521 is a prime.

It is a super-2 number, since 2×813890569² = 1324835716614287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813890509) 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, 878469 + ... + 879394.

It is an arithmetic number, because the mean of its divisors is an integer number (203912224).

Almost surely, 2^813890569 is an apocalyptic number.

It is an amenable number.

813890569 is a deficient number, since it is larger than the sum of its proper divisors (1758327).

813890569 is a wasteful number, since it uses less digits than its factorization.

813890569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758326.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 813890569 is about 28528.7673936327. The cubic root of 813890569 is about 933.6598257271.

The spelling of 813890569 in words is "eight hundred thirteen million, eight hundred ninety thousand, five hundred sixty-nine".