25220231 has 8 divisors (see below), whose sum is σ = 27325584. Its totient is φ = 23184000.

The previous prime is 25220191. The next prime is 25220257. The reversal of 25220231 is 13202252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25220231 is a prime.

It is a super-2 number, since 2×25220231² = 1272120103386722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16520 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (3415698).

Almost surely, 2^25220231 is an apocalyptic number.

25220231 is a deficient number, since it is larger than the sum of its proper divisors (2105353).

25220231 is a wasteful number, since it uses less digits than its factorization.

25220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34561.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 25220231 is about 5021.9748107692. The cubic root of 25220231 is about 293.2578773145.

Adding to 25220231 its reverse (13202252), we get a palindrome (38422483).

The spelling of 25220231 in words is "twenty-five million, two hundred twenty thousand, two hundred thirty-one".