170641979 has 2 divisors, whose sum is σ = 170641980. Its totient is φ = 170641978.

The previous prime is 170641973. The next prime is 170641981. The reversal of 170641979 is 979146071.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170641979 is a prime.

Together with 170641981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (170641973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85320989 + 85320990.

It is an arithmetic number, because the mean of its divisors is an integer number (85320990).

Almost surely, 2^170641979 is an apocalyptic number.

170641979 is a deficient number, since it is larger than the sum of its proper divisors (1).

170641979 is an equidigital number, since it uses as much as digits as its factorization.

170641979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 170641979 is about 13063.0003827605. Note that the first 3 decimals coincide. The cubic root of 170641979 is about 554.6622721407.

The spelling of 170641979 in words is "one hundred seventy million, six hundred forty-one thousand, nine hundred seventy-nine".