170661901 has 2 divisors, whose sum is σ = 170661902. Its totient is φ = 170661900.

The previous prime is 170661853. The next prime is 170661917. The reversal of 170661901 is 109166071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148108900 + 22553001 = 12170^2 + 4749^2 .

It is a cyclic number.

It is not a de Polignac number, because 170661901 - 2⁷ = 170661773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170661941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85330950 + 85330951.

It is an arithmetic number, because the mean of its divisors is an integer number (85330951).

Almost surely, 2^170661901 is an apocalyptic number.

It is an amenable number.

170661901 is a deficient number, since it is larger than the sum of its proper divisors (1).

170661901 is an equidigital number, since it uses as much as digits as its factorization.

170661901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 170661901 is about 13063.7628958888. The cubic root of 170661901 is about 554.6838564188.

The spelling of 170661901 in words is "one hundred seventy million, six hundred sixty-one thousand, nine hundred one".