170113561 has 2 divisors, whose sum is σ = 170113562. Its totient is φ = 170113560.

The previous prime is 170113553. The next prime is 170113583. The reversal of 170113561 is 165311071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160503561 + 9610000 = 12669^2 + 3100^2 .

It is an emirp because it is prime and its reverse (165311071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170113561 - 2³ = 170113553 is a prime.

It is a super-2 number, since 2×170113561² = 57877247272201442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (170113261) 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, 85056780 + 85056781.

It is an arithmetic number, because the mean of its divisors is an integer number (85056781).

Almost surely, 2^170113561 is an apocalyptic number.

It is an amenable number.

170113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

170113561 is an equidigital number, since it uses as much as digits as its factorization.

170113561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 170113561 is about 13042.7589489341. The cubic root of 170113561 is about 554.0891490293.

The spelling of 170113561 in words is "one hundred seventy million, one hundred thirteen thousand, five hundred sixty-one".