170656121 has 8 divisors (see below), whose sum is σ = 174810240. Its totient is φ = 166510512.

The previous prime is 170656091. The next prime is 170656127. The reversal of 170656121 is 121656071.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170656121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170656127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59795 + ... + 62583.

It is an arithmetic number, because the mean of its divisors is an integer number (21851280).

Almost surely, 2^170656121 is an apocalyptic number.

It is an amenable number.

170656121 is a deficient number, since it is larger than the sum of its proper divisors (4154119).

170656121 is a wasteful number, since it uses less digits than its factorization.

170656121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 170656121 is about 13063.5416713845. The cubic root of 170656121 is about 554.6775943126.

Subtracting from 170656121 its reverse (121656071), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 170656121 in words is "one hundred seventy million, six hundred fifty-six thousand, one hundred twenty-one".