172135939 has 2 divisors, whose sum is σ = 172135940. Its totient is φ = 172135938.

The previous prime is 172135919. The next prime is 172135993. The reversal of 172135939 is 939531271.

Together with next prime (172135993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172135939 - 2⁵ = 172135907 is a prime.

It is not a weakly prime, because it can be changed into another prime (172135919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86067969 + 86067970.

It is an arithmetic number, because the mean of its divisors is an integer number (86067970).

Almost surely, 2^172135939 is an apocalyptic number.

172135939 is a deficient number, since it is larger than the sum of its proper divisors (1).

172135939 is an equidigital number, since it uses as much as digits as its factorization.

172135939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 40.

The square root of 172135939 is about 13120.0586507835. The cubic root of 172135939 is about 556.2762491674.

The spelling of 172135939 in words is "one hundred seventy-two million, one hundred thirty-five thousand, nine hundred thirty-nine".