25425431 has 8 divisors (see below), whose sum is σ = 26600400. Its totient is φ = 24270400.

The previous prime is 25425403. The next prime is 25425451. The reversal of 25425431 is 13452452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25425431 is a prime.

It is a super-2 number, since 2×25425431² = 1292905083071522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25425431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25425451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2345 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (3325050).

Almost surely, 2^25425431 is an apocalyptic number.

25425431 is a deficient number, since it is larger than the sum of its proper divisors (1174969).

25425431 is an equidigital number, since it uses as much as digits as its factorization.

25425431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969.

The product of its digits is 4800, while the sum is 26.

The square root of 25425431 is about 5042.3636322661. The cubic root of 25425431 is about 294.0510770930.

Adding to 25425431 its reverse (13452452), we get a palindrome (38877883).

The spelling of 25425431 in words is "twenty-five million, four hundred twenty-five thousand, four hundred thirty-one".