25215513 has 8 divisors (see below), whose sum is σ = 33935328. Its totient is φ = 16653024.

The previous prime is 25215503. The next prime is 25215557. The reversal of 25215513 is 31551252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25215513 - 2⁵ = 25215481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25215503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38956 + ... + 39597.

It is an arithmetic number, because the mean of its divisors is an integer number (4241916).

Almost surely, 2^25215513 is an apocalyptic number.

It is an amenable number.

25215513 is a deficient number, since it is larger than the sum of its proper divisors (8719815).

25215513 is a wasteful number, since it uses less digits than its factorization.

25215513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78663.

The product of its digits is 1500, while the sum is 24.

The square root of 25215513 is about 5021.5050532684. The cubic root of 25215513 is about 293.2395893912.

Adding to 25215513 its reverse (31551252), we get a palindrome (56766765).

The spelling of 25215513 in words is "twenty-five million, two hundred fifteen thousand, five hundred thirteen".