170491457 has 2 divisors, whose sum is σ = 170491458. Its totient is φ = 170491456.

The previous prime is 170491441. The next prime is 170491507. The reversal of 170491457 is 754194071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163814401 + 6677056 = 12799^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 170491457 - 2⁴ = 170491441 is a prime.

It is equal to p_9529085 and since 170491457 and 9529085 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 170491457.

It is not a weakly prime, because it can be changed into another prime (170491417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85245728 + 85245729.

It is an arithmetic number, because the mean of its divisors is an integer number (85245729).

Almost surely, 2^170491457 is an apocalyptic number.

It is an amenable number.

170491457 is a deficient number, since it is larger than the sum of its proper divisors (1).

170491457 is an equidigital number, since it uses as much as digits as its factorization.

170491457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 170491457 is about 13057.2377247257. The cubic root of 170491457 is about 554.4991363650.

The spelling of 170491457 in words is "one hundred seventy million, four hundred ninety-one thousand, four hundred fifty-seven".