169388225 has 6 divisors (see below), whose sum is σ = 210041430. Its totient is φ = 135510560.

The previous prime is 169388213. The next prime is 169388239. The reversal of 169388225 is 522883961.

It can be written as a sum of positive squares in 3 ways, for example, as 17901361 + 151486864 = 4231^2 + 12308^2 .

It is not a de Polignac number, because 169388225 - 2⁴ = 169388209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3387740 + ... + 3387789.

It is an arithmetic number, because the mean of its divisors is an integer number (35006905).

Almost surely, 2^169388225 is an apocalyptic number.

It is an amenable number.

169388225 is a deficient number, since it is larger than the sum of its proper divisors (40653205).

169388225 is an equidigital number, since it uses as much as digits as its factorization.

169388225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775539 (or 6775534 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 169388225 is about 13014.9231653514. The cubic root of 169388225 is about 553.3005123595.

The spelling of 169388225 in words is "one hundred sixty-nine million, three hundred eighty-eight thousand, two hundred twenty-five".