25081513 has 4 divisors (see below), whose sum is σ = 25664848. Its totient is φ = 24498180.

The previous prime is 25081499. The next prime is 25081541. The reversal of 25081513 is 31518052.

It is a happy number.

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 25081513 - 2⁵ = 25081481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25081543) 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, 291603 + ... + 291688.

It is an arithmetic number, because the mean of its divisors is an integer number (6416212).

Almost surely, 2^25081513 is an apocalyptic number.

It is an amenable number.

25081513 is a deficient number, since it is larger than the sum of its proper divisors (583335).

25081513 is an equidigital number, since it uses as much as digits as its factorization.

25081513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583334.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 25081513 is about 5008.1446664409. The cubic root of 25081513 is about 292.7192229983.

Adding to 25081513 its reverse (31518052), we get a palindrome (56599565).

The spelling of 25081513 in words is "twenty-five million, eighty-one thousand, five hundred thirteen".