25431 has 12 divisors (see below), whose sum is σ = 39672. Its totient is φ = 14448.

The previous prime is 25423. The next prime is 25439. The reversal of 25431 is 13452.

It is an interprime number because it is at equal distance from previous prime (25423) and next prime (25439).

It is not a de Polignac number, because 25431 - 2³ = 25423 is a prime.

It is a super-2 number, since 2×25431² = 1293471522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹³ + 5³ + 4⁷ + 3⁶ + 1 .

25431 is a lucky number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 25431.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25431.

It is not an unprimeable number, because it can be changed into a prime (25439) 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, 61 + ... + 233.

It is an arithmetic number, because the mean of its divisors is an integer number (3306).

2²⁵⁴³¹ is an apocalyptic number.

25431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25431 is a deficient number, since it is larger than the sum of its proper divisors (14241).

25431 is a wasteful number, since it uses less digits than its factorization.

25431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 183 counting only the distinct ones).

The product of its digits is 120, while the sum is 15.

The square root of 25431 is about 159.4710004985. The cubic root of 25431 is about 29.4072544456.

Adding to 25431 its reverse (13452), we get a palindrome (38883).

The spelling of 25431 in words is "twenty-five thousand, four hundred thirty-one".