813911623 has 18 divisors (see below), whose sum is σ = 957064472. Its totient is φ = 678035040.

The previous prime is 813911617. The next prime is 813911627. The reversal of 813911623 is 326119318.

It is a de Polignac number, because none of the positive numbers 2^k-813911623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813911627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3094590 + ... + 3094852.

Almost surely, 2^813911623 is an apocalyptic number.

813911623 is a deficient number, since it is larger than the sum of its proper divisors (143152849).

813911623 is an frugal number, since it uses more digits than its factorization.

813911623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 311 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 813911623 is about 28529.1363872095. The cubic root of 813911623 is about 933.6678764018.

The spelling of 813911623 in words is "eight hundred thirteen million, nine hundred eleven thousand, six hundred twenty-three".