25257523 has 4 divisors (see below), whose sum is σ = 25362568. Its totient is φ = 25152480.

The previous prime is 25257509. The next prime is 25257527. The reversal of 25257523 is 32575252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25257523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25257527) 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, 52161 + ... + 52642.

It is an arithmetic number, because the mean of its divisors is an integer number (6340642).

Almost surely, 2^25257523 is an apocalyptic number.

25257523 is a deficient number, since it is larger than the sum of its proper divisors (105045).

25257523 is a wasteful number, since it uses less digits than its factorization.

25257523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105044.

The product of its digits is 21000, while the sum is 31.

The square root of 25257523 is about 5025.6863212899. The cubic root of 25257523 is about 293.4023484590.

It can be divided in two parts, 252 and 57523, that added together give a palindrome (57775).

The spelling of 25257523 in words is "twenty-five million, two hundred fifty-seven thousand, five hundred twenty-three".