17172139 has 2 divisors, whose sum is σ = 17172140. Its totient is φ = 17172138.

The previous prime is 17172137. The next prime is 17172149. The reversal of 17172139 is 93127171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17172139 - 2¹ = 17172137 is a prime.

Together with 17172137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 17172139.

It is not a weakly prime, because it can be changed into another prime (17172137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8586069 + 8586070.

It is an arithmetic number, because the mean of its divisors is an integer number (8586070).

Almost surely, 2^17172139 is an apocalyptic number.

17172139 is a deficient number, since it is larger than the sum of its proper divisors (1).

17172139 is an equidigital number, since it uses as much as digits as its factorization.

17172139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 17172139 is about 4143.9279675207. The cubic root of 17172139 is about 257.9931242284.

The spelling of 17172139 in words is "seventeen million, one hundred seventy-two thousand, one hundred thirty-nine".