25431225 has 24 divisors (see below), whose sum is σ = 42452640. Its totient is φ = 13432320.

The previous prime is 25431223. The next prime is 25431227. The reversal of 25431225 is 52213452.

It is an interprime number because it is at equal distance from previous prime (25431223) and next prime (25431227).

It is not a de Polignac number, because 25431225 - 2¹ = 25431223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25431195 and 25431204.

It is not an unprimeable number, because it can be changed into a prime (25431221) 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, 6441 + ... + 9609.

It is an arithmetic number, because the mean of its divisors is an integer number (1768860).

Almost surely, 2^25431225 is an apocalyptic number.

25431225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25431225 is a deficient number, since it is larger than the sum of its proper divisors (17021415).

25431225 is a wasteful number, since it uses less digits than its factorization.

25431225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289 (or 3284 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 25431225 is about 5042.9381316847. The cubic root of 25431225 is about 294.0734117199.

Adding to 25431225 its reverse (52213452), we get a palindrome (77644677).

The spelling of 25431225 in words is "twenty-five million, four hundred thirty-one thousand, two hundred twenty-five".