170145947 has 2 divisors, whose sum is σ = 170145948. Its totient is φ = 170145946.

The previous prime is 170145907. The next prime is 170145961. The reversal of 170145947 is 749541071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170145947 - 2⁸ = 170145691 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 170145947.

It is not a weakly prime, because it can be changed into another prime (170145907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85072973 + 85072974.

It is an arithmetic number, because the mean of its divisors is an integer number (85072974).

Almost surely, 2^170145947 is an apocalyptic number.

170145947 is a deficient number, since it is larger than the sum of its proper divisors (1).

170145947 is an equidigital number, since it uses as much as digits as its factorization.

170145947 is an evil number, because the sum of its binary digits is even.

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

The square root of 170145947 is about 13044.0004216498. Note that the first 3 decimals coincide. The cubic root of 170145947 is about 554.1243090570.

The spelling of 170145947 in words is "one hundred seventy million, one hundred forty-five thousand, nine hundred forty-seven".