25331513 has 4 divisors (see below), whose sum is σ = 26821620. Its totient is φ = 23841408.

The previous prime is 25331497. The next prime is 25331521. The reversal of 25331513 is 31513352.

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 8133904 + 17197609 = 2852^2 + 4147^2 .

It is a cyclic number.

It is not a de Polignac number, because 25331513 - 2⁴ = 25331497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25331213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745028 + ... + 745061.

It is an arithmetic number, because the mean of its divisors is an integer number (6705405).

Almost surely, 2^25331513 is an apocalyptic number.

It is an amenable number.

25331513 is a deficient number, since it is larger than the sum of its proper divisors (1490107).

25331513 is a wasteful number, since it uses less digits than its factorization.

25331513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490106.

The product of its digits is 1350, while the sum is 23.

The square root of 25331513 is about 5033.0421218186. The cubic root of 25331513 is about 293.6885691369.

Adding to 25331513 its reverse (31513352), we get a palindrome (56844865).

The spelling of 25331513 in words is "twenty-five million, three hundred thirty-one thousand, five hundred thirteen".