172631 has 4 divisors (see below), whose sum is σ = 176352. Its totient is φ = 168912.

The previous prime is 172619. The next prime is 172633. The reversal of 172631 is 136271.

It is a happy number.

172631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172631 is a prime.

It is a super-2 number, since 2×172631² = 59602924322, 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 (172633) 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, 1790 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (44088).

2¹⁷²⁶³¹ is an apocalyptic number.

172631 is a deficient number, since it is larger than the sum of its proper divisors (3721).

172631 is an equidigital number, since it uses as much as digits as its factorization.

172631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720.

The product of its digits is 252, while the sum is 20.

The square root of 172631 is about 415.4888686836. The cubic root of 172631 is about 55.6809020131.

The spelling of 172631 in words is "one hundred seventy-two thousand, six hundred thirty-one".