168139225 has 12 divisors (see below), whose sum is σ = 208699564. Its totient is φ = 134377920.

The previous prime is 168139217. The next prime is 168139229. The reversal of 168139225 is 522931861.

It can be written as a sum of positive squares in 6 ways, for example, as 99856 + 168039369 = 316^2 + 12963^2 .

It is not a de Polignac number, because 168139225 - 2³ = 168139217 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168139229) 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 11 ways as a sum of consecutive naturals, for example, 28207 + ... + 33643.

Almost surely, 2^168139225 is an apocalyptic number.

It is an amenable number.

168139225 is a deficient number, since it is larger than the sum of its proper divisors (40560339).

168139225 is a wasteful number, since it uses less digits than its factorization.

168139225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684 (or 6679 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 168139225 is about 12966.8510055449. The cubic root of 168139225 is about 551.9372182764.

The spelling of 168139225 in words is "one hundred sixty-eight million, one hundred thirty-nine thousand, two hundred twenty-five".