813172705 has 16 divisors (see below), whose sum is σ = 1023379200. Its totient is φ = 619109568.

The previous prime is 813172667. The next prime is 813172729. The reversal of 813172705 is 507271318.

It is a cyclic number.

It is not a de Polignac number, because 813172705 - 2²⁹ = 276301793 is a prime.

It is a super-2 number, since 2×813172705² = 1322499696314034050, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5119 + ... + 40651.

It is an arithmetic number, because the mean of its divisors is an integer number (63961200).

Almost surely, 2^813172705 is an apocalyptic number.

It is an amenable number.

813172705 is a deficient number, since it is larger than the sum of its proper divisors (210206495).

813172705 is a wasteful number, since it uses less digits than its factorization.

813172705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35760.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 813172705 is about 28516.1832123445. The cubic root of 813172705 is about 933.3852442074.

The spelling of 813172705 in words is "eight hundred thirteen million, one hundred seventy-two thousand, seven hundred five".