25523257 has 4 divisors (see below), whose sum is σ = 25543296. Its totient is φ = 25503220.

The previous prime is 25523243. The next prime is 25523287. The reversal of 25523257 is 75232552.

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 25523257 - 2¹⁵ = 25490489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25523207) 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, 7969 + ... + 10702.

It is an arithmetic number, because the mean of its divisors is an integer number (6385824).

Almost surely, 2^25523257 is an apocalyptic number.

It is an amenable number.

25523257 is a deficient number, since it is larger than the sum of its proper divisors (20039).

25523257 is a wasteful number, since it uses less digits than its factorization.

25523257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20038.

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

The square root of 25523257 is about 5052.0547305032. The cubic root of 25523257 is about 294.4277213344.

The spelling of 25523257 in words is "twenty-five million, five hundred twenty-three thousand, two hundred fifty-seven".