25315231 has 8 divisors (see below), whose sum is σ = 26329680. Its totient is φ = 24310272.

The previous prime is 25315229. The next prime is 25315253. The reversal of 25315231 is 13251352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25315231 - 2¹ = 25315229 is a prime.

It is a super-2 number, since 2×25315231² = 1281721841166722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25318231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336 + ... + 7858.

It is an arithmetic number, because the mean of its divisors is an integer number (3291210).

Almost surely, 2^25315231 is an apocalyptic number.

25315231 is a deficient number, since it is larger than the sum of its proper divisors (1014449).

25315231 is a wasteful number, since it uses less digits than its factorization.

25315231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745.

The product of its digits is 900, while the sum is 22.

The square root of 25315231 is about 5031.4243510163. The cubic root of 25315231 is about 293.6256322176.

Adding to 25315231 its reverse (13251352), we get a palindrome (38566583).

The spelling of 25315231 in words is "twenty-five million, three hundred fifteen thousand, two hundred thirty-one".