25427431 has 2 divisors, whose sum is σ = 25427432. Its totient is φ = 25427430.

The previous prime is 25427429. The next prime is 25427477. The reversal of 25427431 is 13472452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25427431 - 2¹ = 25427429 is a prime.

It is a super-2 number, since 2×25427431² = 1293108494519522, which contains 22 as substring.

Together with 25427429, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25427431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25427401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12713715 + 12713716.

It is an arithmetic number, because the mean of its divisors is an integer number (12713716).

Almost surely, 2^25427431 is an apocalyptic number.

25427431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25427431 is an equidigital number, since it uses as much as digits as its factorization.

25427431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 28.

The square root of 25427431 is about 5042.5619480578. The cubic root of 25427431 is about 294.0587870474.

Adding to 25427431 its reverse (13472452), we get a palindrome (38899883).

The spelling of 25427431 in words is "twenty-five million, four hundred twenty-seven thousand, four hundred thirty-one".