25662431 has 2 divisors, whose sum is σ = 25662432. Its totient is φ = 25662430.

The previous prime is 25662409. The next prime is 25662467. The reversal of 25662431 is 13426652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25662431 - 2¹⁰ = 25661407 is a prime.

It is a super-2 number, since 2×25662431² = 1317120729659522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25662394 and 25662403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25662731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831215 + 12831216.

It is an arithmetic number, because the mean of its divisors is an integer number (12831216).

Almost surely, 2^25662431 is an apocalyptic number.

25662431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25662431 is an equidigital number, since it uses as much as digits as its factorization.

25662431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 25662431 is about 5065.8100043330. The cubic root of 25662431 is about 294.9619064093.

The spelling of 25662431 in words is "twenty-five million, six hundred sixty-two thousand, four hundred thirty-one".