813393239 has 2 divisors, whose sum is σ = 813393240. Its totient is φ = 813393238.

The previous prime is 813393181. The next prime is 813393257. The reversal of 813393239 is 932393318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 813393239 - 2²⁸ = 544957783 is a prime.

It is a super-2 number, since 2×813393239² = 1323217122501822242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813393196 and 813393205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813395239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406696619 + 406696620.

It is an arithmetic number, because the mean of its divisors is an integer number (406696620).

Almost surely, 2^813393239 is an apocalyptic number.

813393239 is a deficient number, since it is larger than the sum of its proper divisors (1).

813393239 is an equidigital number, since it uses as much as digits as its factorization.

813393239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 813393239 is about 28520.0497720463. The cubic root of 813393239 is about 933.4696152045.

The spelling of 813393239 in words is "eight hundred thirteen million, three hundred ninety-three thousand, two hundred thirty-nine".