13515225025 has 9 divisors (see below), whose sum is σ = 16759599843. Its totient is φ = 10811715000.

The previous prime is 13515225019. The next prime is 13515225043. The reversal of 13515225025 is 52052251531.

The square root of 13515225025 is 116255.

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

It can be written as a sum of positive squares in only one way, i.e., 4865481009 + 8649744016 = 69753^2 + 93004^2 .

It is not a de Polignac number, because 13515225025 - 2¹⁹ = 13514700737 is a prime.

It is a super-2 number, since 2×13515225025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 569650 + ... + 592900.

Almost surely, 2^13515225025 is an apocalyptic number.

13515225025 is the 116255-th square number.

13515225025 is the 58128-th centered octagonal number.

It is an amenable number.

13515225025 is a deficient number, since it is larger than the sum of its proper divisors (3244374818).

13515225025 is an frugal number, since it uses more digits than its factorization.

13515225025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46512 (or 23256 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

Adding to 13515225025 its reverse (52052251531), we get a palindrome (65567476556).

The spelling of 13515225025 in words is "thirteen billion, five hundred fifteen million, two hundred twenty-five thousand, twenty-five".