813172 has 6 divisors (see below), whose sum is σ = 1423058. Its totient is φ = 406584.

The previous prime is 813167. The next prime is 813199. The reversal of 813172 is 271318.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 45796 = 876^2 + 214^2 .

It is a super-2 number, since 2×813172² = 1322497403168, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

813172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101643 + ... + 101650.

2⁸¹³¹⁷² is an apocalyptic number.

It is an amenable number.

813172 is a deficient number, since it is larger than the sum of its proper divisors (609886).

813172 is a wasteful number, since it uses less digits than its factorization.

813172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203297 (or 203295 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 813172 is about 901.7605003547. The cubic root of 813172 is about 93.3384974467.

The spelling of 813172 in words is "eight hundred thirteen thousand, one hundred seventy-two".