25215013 has 4 divisors (see below), whose sum is σ = 25228588. Its totient is φ = 25201440.

The previous prime is 25214999. The next prime is 25215049. The reversal of 25215013 is 31051252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11950849 + 13264164 = 3457^2 + 3642^2 .

It is a cyclic number.

It is not a de Polignac number, because 25215013 - 2¹⁷ = 25083941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3456 + ... + 7897.

It is an arithmetic number, because the mean of its divisors is an integer number (6307147).

Almost surely, 2^25215013 is an apocalyptic number.

It is an amenable number.

25215013 is a deficient number, since it is larger than the sum of its proper divisors (13575).

25215013 is a wasteful number, since it uses less digits than its factorization.

25215013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13574.

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

The square root of 25215013 is about 5021.4552671511. The cubic root of 25215013 is about 293.2376511563.

Adding to 25215013 its reverse (31051252), we get a palindrome (56266265).

The spelling of 25215013 in words is "twenty-five million, two hundred fifteen thousand, thirteen".