169561625 has 16 divisors (see below), whose sum is σ = 212863248. Its totient is φ = 134848000.

The previous prime is 169561619. The next prime is 169561627. The reversal of 169561625 is 526165961.

It can be written as a sum of positive squares in 8 ways, for example, as 30958096 + 138603529 = 5564^2 + 11773^2 .

It is a de Polignac number, because none of the positive numbers 2^k-169561625 is a prime.

It is a super-2 number, since 2×169561625² = 57502289345281250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169561627) 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 in 15 ways as a sum of consecutive naturals, for example, 17705 + ... + 25545.

It is an arithmetic number, because the mean of its divisors is an integer number (13303953).

Almost surely, 2^169561625 is an apocalyptic number.

It is an amenable number.

169561625 is a deficient number, since it is larger than the sum of its proper divisors (43301623).

169561625 is an equidigital number, since it uses as much as digits as its factorization.

169561625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8029 (or 8019 counting only the distinct ones).

The product of its digits is 97200, while the sum is 41.

The square root of 169561625 is about 13021.5830450833. The cubic root of 169561625 is about 553.4892495818.

It can be divided in two parts, 16956 and 1625, that added together give a palindrome (18581).

The spelling of 169561625 in words is "one hundred sixty-nine million, five hundred sixty-one thousand, six hundred twenty-five".