813275439 has 4 divisors (see below), whose sum is σ = 1084367256. Its totient is φ = 542183624.

The previous prime is 813275431. The next prime is 813275443. The reversal of 813275439 is 934572318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 813275439 - 2³ = 813275431 is a prime.

It is a super-2 number, since 2×813275439² = 1322833879361285442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813275439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813275431) 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, 135545904 + ... + 135545909.

It is an arithmetic number, because the mean of its divisors is an integer number (271091814).

Almost surely, 2^813275439 is an apocalyptic number.

813275439 is a deficient number, since it is larger than the sum of its proper divisors (271091817).

813275439 is a wasteful number, since it uses less digits than its factorization.

813275439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271091816.

The product of its digits is 181440, while the sum is 42.

The square root of 813275439 is about 28517.9844834799. The cubic root of 813275439 is about 933.4245496592.

It can be divided in two parts, 81 and 3275439, that added together give a triangular number (3275520 = T₂₅₅₉).

The spelling of 813275439 in words is "eight hundred thirteen million, two hundred seventy-five thousand, four hundred thirty-nine".