25353531 has 48 divisors (see below), whose sum is σ = 43929600. Its totient is φ = 14076720.

The previous prime is 25353529. The next prime is 25353551. The reversal of 25353531 is 13535352.

It is not a de Polignac number, because 25353531 - 2¹ = 25353529 is a prime.

It is a super-2 number, since 2×25353531² = 1285603068335922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25353495 and 25353504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25353551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132646 + ... + 132836.

It is an arithmetic number, because the mean of its divisors is an integer number (915200).

Almost surely, 2^25353531 is an apocalyptic number.

25353531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25353531 is a deficient number, since it is larger than the sum of its proper divisors (18576069).

25353531 is a wasteful number, since it uses less digits than its factorization.

25353531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 244 counting only the distinct ones).

The product of its digits is 6750, while the sum is 27.

The square root of 25353531 is about 5035.2289918136. The cubic root of 25353531 is about 293.7736352795.

Adding to 25353531 its reverse (13535352), we get a palindrome (38888883).

The spelling of 25353531 in words is "twenty-five million, three hundred fifty-three thousand, five hundred thirty-one".