25021513 has 4 divisors (see below), whose sum is σ = 27296208. Its totient is φ = 22746820.

The previous prime is 25021511. The next prime is 25021541. The reversal of 25021513 is 31512052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25021513 - 2¹ = 25021511 is a prime.

It is a super-2 number, since 2×25021513² = 1252152225618338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25021511) 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, 1137331 + ... + 1137352.

It is an arithmetic number, because the mean of its divisors is an integer number (6824052).

Almost surely, 2^25021513 is an apocalyptic number.

It is an amenable number.

25021513 is a deficient number, since it is larger than the sum of its proper divisors (2274695).

25021513 is a wasteful number, since it uses less digits than its factorization.

25021513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274694.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 25021513 is about 5002.1508373899. The cubic root of 25021513 is about 292.4856222996.

Adding to 25021513 its reverse (31512052), we get a palindrome (56533565).

The spelling of 25021513 in words is "twenty-five million, twenty-one thousand, five hundred thirteen".