25615313 has 2 divisors, whose sum is σ = 25615314. Its totient is φ = 25615312.

The previous prime is 25615297. The next prime is 25615349. The reversal of 25615313 is 31351652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22819729 + 2795584 = 4777^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 25615313 - 2⁴ = 25615297 is a prime.

It is a super-2 number, since 2×25615313² = 1312288520175938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25615013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12807656 + 12807657.

It is an arithmetic number, because the mean of its divisors is an integer number (12807657).

Almost surely, 2^25615313 is an apocalyptic number.

It is an amenable number.

25615313 is a deficient number, since it is larger than the sum of its proper divisors (1).

25615313 is an equidigital number, since it uses as much as digits as its factorization.

25615313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 25615313 is about 5061.1572787259. The cubic root of 25615313 is about 294.7812723182.

Adding to 25615313 its reverse (31351652), we get a palindrome (56966965).

The spelling of 25615313 in words is "twenty-five million, six hundred fifteen thousand, three hundred thirteen".