172117507 has 2 divisors, whose sum is σ = 172117508. Its totient is φ = 172117506.

The previous prime is 172117489. The next prime is 172117511. The reversal of 172117507 is 705711271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172117507 - 2²³ = 163728899 is a prime.

It is not a weakly prime, because it can be changed into another prime (172117307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86058753 + 86058754.

It is an arithmetic number, because the mean of its divisors is an integer number (86058754).

Almost surely, 2^172117507 is an apocalyptic number.

172117507 is a deficient number, since it is larger than the sum of its proper divisors (1).

172117507 is an equidigital number, since it uses as much as digits as its factorization.

172117507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3430, while the sum is 31.

The square root of 172117507 is about 13119.3561960944. The cubic root of 172117507 is about 556.2563934459.

Adding to 172117507 its reverse (705711271), we get a palindrome (877828778).

The spelling of 172117507 in words is "one hundred seventy-two million, one hundred seventeen thousand, five hundred seven".