172806631 has 4 divisors (see below), whose sum is σ = 172913832. Its totient is φ = 172699432.

The previous prime is 172806629. The next prime is 172806661. The reversal of 172806631 is 136608271.

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 172806631 - 2¹ = 172806629 is a prime.

It is a super-2 number, since 2×172806631² = 59724263435140322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172806611) 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, 51145 + ... + 54418.

It is an arithmetic number, because the mean of its divisors is an integer number (43228458).

Almost surely, 2^172806631 is an apocalyptic number.

172806631 is a deficient number, since it is larger than the sum of its proper divisors (107201).

172806631 is a wasteful number, since it uses less digits than its factorization.

172806631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107200.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 172806631 is about 13145.5935963349. The cubic root of 172806631 is about 556.9977845664.

The spelling of 172806631 in words is "one hundred seventy-two million, eight hundred six thousand, six hundred thirty-one".