25331530 has 48 divisors (see below), whose sum is σ = 56179656. Its totient is φ = 8171520.

The previous prime is 25331521. The next prime is 25331539. The reversal of 25331530 is 3513352.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25331521) and next prime (25331539).

It can be written as a sum of positive squares in 4 ways, for example, as 25331089 + 441 = 5033^2 + 21^2 .

It is not an unprimeable number, because it can be changed into a prime (25331539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6810 + ... + 9850.

Almost surely, 2^25331530 is an apocalyptic number.

25331530 is an abundant number, since it is smaller than the sum of its proper divisors (30848126).

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

25331530 is a wasteful number, since it uses less digits than its factorization.

25331530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079 (or 3072 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 25331530 is about 5033.0438106577. The cubic root of 25331530 is about 293.6886348351.

Adding to 25331530 its reverse (3513352), we get a palindrome (28844882).

The spelling of 25331530 in words is "twenty-five million, three hundred thirty-one thousand, five hundred thirty".