169390225 has 27 divisors (see below), whose sum is σ = 223310577. Its totient is φ = 127442880.

The previous prime is 169390211. The next prime is 169390237. The reversal of 169390225 is 522093961.

The square root of 169390225 is 13015.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 494209 + 168896016 = 703^2 + 12996^2 .

It is not a de Polignac number, because 169390225 - 2⁷ = 169390097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1236357 + ... + 1236493.

Almost surely, 2^169390225 is an apocalyptic number.

169390225 is the 13015-th square number.

169390225 is the 6508-th centered octagonal number.

It is an amenable number.

169390225 is a deficient number, since it is larger than the sum of its proper divisors (53920352).

169390225 is an equidigital number, since it uses as much as digits as its factorization.

169390225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The cubic root of 169390225 is about 553.3026899935.

The spelling of 169390225 in words is "one hundred sixty-nine million, three hundred ninety thousand, two hundred twenty-five".