25315519 has 4 divisors (see below), whose sum is σ = 25904296. Its totient is φ = 24726744.

The previous prime is 25315513. The next prime is 25315523. The reversal of 25315519 is 91551352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25315519 - 2⁹ = 25315007 is a prime.

It is a super-2 number, since 2×25315519² = 1281751004478722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25315513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294324 + ... + 294409.

It is an arithmetic number, because the mean of its divisors is an integer number (6476074).

Almost surely, 2^25315519 is an apocalyptic number.

25315519 is a deficient number, since it is larger than the sum of its proper divisors (588777).

25315519 is an equidigital number, since it uses as much as digits as its factorization.

25315519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588776.

The product of its digits is 6750, while the sum is 31.

The square root of 25315519 is about 5031.4529710611. The cubic root of 25315519 is about 293.6267456956.

The spelling of 25315519 in words is "twenty-five million, three hundred fifteen thousand, five hundred nineteen".