25516413 has 18 divisors (see below), whose sum is σ = 39777374. Its totient is φ = 15668784.

The previous prime is 25516367. The next prime is 25516423. The reversal of 25516413 is 31461552.

It can be written as a sum of positive squares in only one way, i.e., 17665209 + 7851204 = 4203^2 + 2802^2 .

It is not a de Polignac number, because 25516413 - 2⁶ = 25516349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25516423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 54406 + ... + 54872.

Almost surely, 2^25516413 is an apocalyptic number.

It is an amenable number.

25516413 is a deficient number, since it is larger than the sum of its proper divisors (14260961).

25516413 is an equidigital number, since it uses as much as digits as its factorization.

25516413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 483 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 25516413 is about 5051.3773369250. The cubic root of 25516413 is about 294.4014022866.

Adding to 25516413 its reverse (31461552), we get a palindrome (56977965).

The spelling of 25516413 in words is "twenty-five million, five hundred sixteen thousand, four hundred thirteen".