25131222 has 40 divisors (see below), whose sum is σ = 57394656. Its totient is φ = 8216208.

The previous prime is 25131217. The next prime is 25131233. The reversal of 25131222 is 22213152.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25131195 and 25131204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7123 + ... + 10049.

Almost surely, 2^25131222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25131222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28697328).

25131222 is an abundant number, since it is smaller than the sum of its proper divisors (32263434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25131222 is a wasteful number, since it uses less digits than its factorization.

25131222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994 (or 2985 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 25131222 is about 5013.1050258298. The cubic root of 25131222 is about 292.9124752648.

Adding to 25131222 its reverse (22213152), we get a palindrome (47344374).

The spelling of 25131222 in words is "twenty-five million, one hundred thirty-one thousand, two hundred twenty-two".