25304531 has 12 divisors (see below), whose sum is σ = 30717072. Its totient is φ = 20745648.

The previous prime is 25304527. The next prime is 25304549. The reversal of 25304531 is 13540352.

It is not a de Polignac number, because 25304531 - 2² = 25304527 is a prime.

It is a super-2 number, since 2×25304531² = 1280638578259922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25304497 and 25304506.

It is not an unprimeable number, because it can be changed into a prime (25304581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10100 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (2559756).

Almost surely, 2^25304531 is an apocalyptic number.

25304531 is a deficient number, since it is larger than the sum of its proper divisors (5412541).

25304531 is a wasteful number, since it uses less digits than its factorization.

25304531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22490 (or 22483 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 25304531 is about 5030.3609214449. The cubic root of 25304531 is about 293.5842574287.

Adding to 25304531 its reverse (13540352), we get a palindrome (38844883).

The spelling of 25304531 in words is "twenty-five million, three hundred four thousand, five hundred thirty-one".