172085131 has 4 divisors (see below), whose sum is σ = 173141032. Its totient is φ = 171029232.

The previous prime is 172085119. The next prime is 172085143. The reversal of 172085131 is 131580271.

172085131 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, and also an emirpimes, since its reverse is a distinct semiprime: 131580271 = 1931 ⋅68141.

It is an interprime number because it is at equal distance from previous prime (172085119) and next prime (172085143).

It is a cyclic number.

It is not a de Polignac number, because 172085131 - 2⁵ = 172085099 is a prime.

It is a super-2 number, since 2×172085131² = 59226584622574322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172085131.

It is not an unprimeable number, because it can be changed into a prime (172085161) 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, 527706 + ... + 528031.

It is an arithmetic number, because the mean of its divisors is an integer number (43285258).

Almost surely, 2^172085131 is an apocalyptic number.

172085131 is a deficient number, since it is larger than the sum of its proper divisors (1055901).

172085131 is a wasteful number, since it uses less digits than its factorization.

172085131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055900.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 172085131 is about 13118.1222360519. The cubic root of 172085131 is about 556.2215132321.

The spelling of 172085131 in words is "one hundred seventy-two million, eighty-five thousand, one hundred thirty-one".