170491439 has 2 divisors, whose sum is σ = 170491440. Its totient is φ = 170491438.

The previous prime is 170491421. The next prime is 170491441. The reversal of 170491439 is 934194071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170491439 - 2⁸ = 170491183 is a prime.

It is a Sophie Germain prime.

Together with 170491441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170491039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85245719 + 85245720.

It is an arithmetic number, because the mean of its divisors is an integer number (85245720).

Almost surely, 2^170491439 is an apocalyptic number.

170491439 is a deficient number, since it is larger than the sum of its proper divisors (1).

170491439 is an equidigital number, since it uses as much as digits as its factorization.

170491439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 170491439 is about 13057.2370354528. The cubic root of 170491439 is about 554.4991168508.

The spelling of 170491439 in words is "one hundred seventy million, four hundred ninety-one thousand, four hundred thirty-nine".