172561031 has 4 divisors (see below), whose sum is σ = 172593864. Its totient is φ = 172528200.

The previous prime is 172560967. The next prime is 172561063. The reversal of 172561031 is 130165271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130165271 = 2801 ⋅46471.

It is a cyclic number.

It is not a de Polignac number, because 172561031 - 2⁶ = 172560967 is a prime.

It is a super-2 number, since 2×172561031² = 59554618839565922, 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 (172561331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6560 + ... + 19701.

It is an arithmetic number, because the mean of its divisors is an integer number (43148466).

Almost surely, 2^172561031 is an apocalyptic number.

172561031 is a deficient number, since it is larger than the sum of its proper divisors (32833).

172561031 is an equidigital number, since it uses as much as digits as its factorization.

172561031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32832.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 172561031 is about 13136.2487415548. The cubic root of 172561031 is about 556.7337832868.

The spelling of 172561031 in words is "one hundred seventy-two million, five hundred sixty-one thousand, thirty-one".