25513216 has 18 divisors (see below), whose sum is σ = 50927282. Its totient is φ = 12756480.

The previous prime is 25513199. The next prime is 25513247. The reversal of 25513216 is 61231552.

It can be written as a sum of positive squares in only one way, i.e., 22127616 + 3385600 = 4704^2 + 1840^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49575 + ... + 50086.

Almost surely, 2^25513216 is an apocalyptic number.

It is an amenable number.

25513216 is a deficient number, since it is larger than the sum of its proper divisors (25414066).

25513216 is an frugal number, since it uses more digits than its factorization.

25513216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99677 (or 99663 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 25513216 is about 5051.0608786670. The cubic root of 25513216 is about 294.3891064022.

Adding to 25513216 its reverse (61231552), we get a palindrome (86744768).

The spelling of 25513216 in words is "twenty-five million, five hundred thirteen thousand, two hundred sixteen".