13138225 has 6 divisors (see below), whose sum is σ = 16291430. Its totient is φ = 10510560.

The previous prime is 13138217. The next prime is 13138243. The reversal of 13138225 is 52283131.

It can be written as a sum of positive squares in 3 ways, for example, as 414736 + 12723489 = 644^2 + 3567^2 .

It is not a de Polignac number, because 13138225 - 2³ = 13138217 is a prime.

It is a super-2 number, since 2×13138225² = 345225912301250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 525529 = 13138225 / (1 + 3 + 1 + 3 + 8 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13138225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262740 + ... + 262789.

Almost surely, 2^13138225 is an apocalyptic number.

It is an amenable number.

13138225 is a deficient number, since it is larger than the sum of its proper divisors (3153205).

13138225 is an equidigital number, since it uses as much as digits as its factorization.

13138225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525539 (or 525534 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 13138225 is about 3624.6689504009. The cubic root of 13138225 is about 235.9638997257.

The spelling of 13138225 in words is "thirteen million, one hundred thirty-eight thousand, two hundred twenty-five".