170425921 has 2 divisors, whose sum is σ = 170425922. Its totient is φ = 170425920.

The previous prime is 170425919. The next prime is 170425939. The reversal of 170425921 is 129524071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167314225 + 3111696 = 12935^2 + 1764^2 .

It is a cyclic number.

It is not a de Polignac number, because 170425921 - 2¹ = 170425919 is a prime.

Together with 170425919, 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 (170425961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85212960 + 85212961.

It is an arithmetic number, because the mean of its divisors is an integer number (85212961).

Almost surely, 2^170425921 is an apocalyptic number.

It is an amenable number.

170425921 is a deficient number, since it is larger than the sum of its proper divisors (1).

170425921 is an equidigital number, since it uses as much as digits as its factorization.

170425921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 170425921 is about 13054.7279175018. The cubic root of 170425921 is about 554.4280784299.

Adding to 170425921 its reverse (129524071), we get a palindrome (299949992).

The spelling of 170425921 in words is "one hundred seventy million, four hundred twenty-five thousand, nine hundred twenty-one".