172730831 has 12 divisors (see below), whose sum is σ = 216388872. Its totient is φ = 136665648.

The previous prime is 172730813. The next prime is 172730839. The reversal of 172730831 is 138037271.

It is a de Polignac number, because none of the positive numbers 2^k-172730831 is a prime.

It is a super-2 number, since 2×172730831² = 59671879955901122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172730839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134945 + ... + 136218.

It is an arithmetic number, because the mean of its divisors is an integer number (18032406).

Almost surely, 2^172730831 is an apocalyptic number.

172730831 is a deficient number, since it is larger than the sum of its proper divisors (43658041).

172730831 is a wasteful number, since it uses less digits than its factorization.

172730831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271190 (or 271183 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 172730831 is about 13142.7101847374. The cubic root of 172730831 is about 556.9163320462.

The spelling of 172730831 in words is "one hundred seventy-two million, seven hundred thirty thousand, eight hundred thirty-one".