170872139 has 2 divisors, whose sum is σ = 170872140. Its totient is φ = 170872138.

The previous prime is 170872127. The next prime is 170872223. The reversal of 170872139 is 931278071.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 170872139 - 2⁴ = 170872123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (170872109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85436069 + 85436070.

It is an arithmetic number, because the mean of its divisors is an integer number (85436070).

Almost surely, 2^170872139 is an apocalyptic number.

170872139 is a deficient number, since it is larger than the sum of its proper divisors (1).

170872139 is an equidigital number, since it uses as much as digits as its factorization.

170872139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 170872139 is about 13071.8070288694. The cubic root of 170872139 is about 554.9115342046.

The spelling of 170872139 in words is "one hundred seventy million, eight hundred seventy-two thousand, one hundred thirty-nine".