25537013 has 4 divisors (see below), whose sum is σ = 25579020. Its totient is φ = 25495008.

The previous prime is 25537003. The next prime is 25537019. The reversal of 25537013 is 31073552.

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 7711729 + 17825284 = 2777^2 + 4222^2 .

It is a cyclic number.

It is not a de Polignac number, because 25537013 - 2⁴ = 25536997 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 (25537019) 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, 20078 + ... + 21311.

It is an arithmetic number, because the mean of its divisors is an integer number (6394755).

Almost surely, 2^25537013 is an apocalyptic number.

It is an amenable number.

25537013 is a deficient number, since it is larger than the sum of its proper divisors (42007).

25537013 is an equidigital number, since it uses as much as digits as its factorization.

25537013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42006.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 25537013 is about 5053.4159733788. The cubic root of 25537013 is about 294.4806067000.

The spelling of 25537013 in words is "twenty-five million, five hundred thirty-seven thousand, thirteen".