170551891 has 2 divisors, whose sum is σ = 170551892. Its totient is φ = 170551890.

The previous prime is 170551883. The next prime is 170551897. The reversal of 170551891 is 198155071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170551891 - 2³ = 170551883 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 170551891.

It is not a weakly prime, because it can be changed into another prime (170551897) 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, 85275945 + 85275946.

It is an arithmetic number, because the mean of its divisors is an integer number (85275946).

Almost surely, 2^170551891 is an apocalyptic number.

170551891 is a deficient number, since it is larger than the sum of its proper divisors (1).

170551891 is an equidigital number, since it uses as much as digits as its factorization.

170551891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 170551891 is about 13059.5517151241. The cubic root of 170551891 is about 554.5646462790.

The spelling of 170551891 in words is "one hundred seventy million, five hundred fifty-one thousand, eight hundred ninety-one".