25245515 has 16 divisors (see below), whose sum is σ = 32076000. Its totient is φ = 19041792.

The previous prime is 25245499. The next prime is 25245523. The reversal of 25245515 is 51554252.

25245515 = 230² + 231² + ... + 444².

It is a cyclic number.

It is not a de Polignac number, because 25245515 - 2⁴ = 25245499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4211 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (2004750).

Almost surely, 2^25245515 is an apocalyptic number.

25245515 is a deficient number, since it is larger than the sum of its proper divisors (6830485).

25245515 is a wasteful number, since it uses less digits than its factorization.

25245515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126.

The product of its digits is 10000, while the sum is 29.

The square root of 25245515 is about 5024.4915165617. The cubic root of 25245515 is about 293.3558443755.

Adding to 25245515 its reverse (51554252), we get a palindrome (76799767).

The spelling of 25245515 in words is "twenty-five million, two hundred forty-five thousand, five hundred fifteen".