170940391 has 2 divisors, whose sum is σ = 170940392. Its totient is φ = 170940390.

The previous prime is 170940331. The next prime is 170940401. The reversal of 170940391 is 193049071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170940391 - 2¹¹ = 170938343 is a prime.

It is equal to p_9552715 and since 170940391 and 9552715 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170940331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85470195 + 85470196.

It is an arithmetic number, because the mean of its divisors is an integer number (85470196).

Almost surely, 2^170940391 is an apocalyptic number.

170940391 is a deficient number, since it is larger than the sum of its proper divisors (1).

170940391 is an equidigital number, since it uses as much as digits as its factorization.

170940391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 170940391 is about 13074.4174248798. The cubic root of 170940391 is about 554.9854077272.

The spelling of 170940391 in words is "one hundred seventy million, nine hundred forty thousand, three hundred ninety-one".