813404563 has 4 divisors (see below), whose sum is σ = 813590568. Its totient is φ = 813218560.

The previous prime is 813404551. The next prime is 813404569. The reversal of 813404563 is 365404318.

It is a happy number.

813404563 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 an emirpimes, since its reverse is a distinct semiprime: 365404318 = 2 ⋅182702159.

It is a cyclic number.

It is not a de Polignac number, because 813404563 - 2²⁹ = 276533651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813404569) 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, 86281 + ... + 95242.

It is an arithmetic number, because the mean of its divisors is an integer number (203397642).

Almost surely, 2^813404563 is an apocalyptic number.

813404563 is a deficient number, since it is larger than the sum of its proper divisors (186005).

813404563 is a wasteful number, since it uses less digits than its factorization.

813404563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186004.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 813404563 is about 28520.2482983581. The cubic root of 813404563 is about 933.4739470825.

The spelling of 813404563 in words is "eight hundred thirteen million, four hundred four thousand, five hundred sixty-three".