172083391 has 2 divisors, whose sum is σ = 172083392. Its totient is φ = 172083390.

The previous prime is 172083343. The next prime is 172083407. The reversal of 172083391 is 193380271.

172083391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172083391 - 2²⁵ = 138528959 is a prime.

It is a super-2 number, since 2×172083391² = 59225386916117762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172083311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86041695 + 86041696.

It is an arithmetic number, because the mean of its divisors is an integer number (86041696).

Almost surely, 2^172083391 is an apocalyptic number.

172083391 is a deficient number, since it is larger than the sum of its proper divisors (1).

172083391 is an equidigital number, since it uses as much as digits as its factorization.

172083391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 172083391 is about 13118.0559154167. The cubic root of 172083391 is about 556.2196385229.

The spelling of 172083391 in words is "one hundred seventy-two million, eighty-three thousand, three hundred ninety-one".