25717231 has 4 divisors (see below), whose sum is σ = 25786552. Its totient is φ = 25647912.

The previous prime is 25717217. The next prime is 25717249. The reversal of 25717231 is 13271752.

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-25717231 is a prime.

It is a super-2 number, since 2×25717231² = 1322751940614722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25717231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25717201) 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, 34101 + ... + 34846.

It is an arithmetic number, because the mean of its divisors is an integer number (6446638).

Almost surely, 2^25717231 is an apocalyptic number.

25717231 is a deficient number, since it is larger than the sum of its proper divisors (69321).

25717231 is an equidigital number, since it uses as much as digits as its factorization.

25717231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69320.

The product of its digits is 2940, while the sum is 28.

The square root of 25717231 is about 5071.2159291436. The cubic root of 25717231 is about 295.1717127281.

Adding to 25717231 its reverse (13271752), we get a palindrome (38988983).

The spelling of 25717231 in words is "twenty-five million, seven hundred seventeen thousand, two hundred thirty-one".