170972509 has 2 divisors, whose sum is σ = 170972510. Its totient is φ = 170972508.

The previous prime is 170972479. The next prime is 170972537. The reversal of 170972509 is 905279071.

170972509 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 can be written as a sum of positive squares in only one way, i.e., 168428484 + 2544025 = 12978^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 170972509 - 2⁷ = 170972381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170972579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85486254 + 85486255.

It is an arithmetic number, because the mean of its divisors is an integer number (85486255).

Almost surely, 2^170972509 is an apocalyptic number.

It is an amenable number.

170972509 is a deficient number, since it is larger than the sum of its proper divisors (1).

170972509 is an equidigital number, since it uses as much as digits as its factorization.

170972509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 170972509 is about 13075.6456437149. The cubic root of 170972509 is about 555.0201642973.

The spelling of 170972509 in words is "one hundred seventy million, nine hundred seventy-two thousand, five hundred nine".