25619431 has 2 divisors, whose sum is σ = 25619432. Its totient is φ = 25619430.

The previous prime is 25619413. The next prime is 25619437. The reversal of 25619431 is 13491652.

Together with previous prime (25619413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25619431 is a prime.

It is a super-2 number, since 2×25619431² = 1312710489527522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25619393 and 25619402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25619437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12809715 + 12809716.

It is an arithmetic number, because the mean of its divisors is an integer number (12809716).

Almost surely, 2^25619431 is an apocalyptic number.

25619431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25619431 is an equidigital number, since it uses as much as digits as its factorization.

25619431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 25619431 is about 5061.5640863275. The cubic root of 25619431 is about 294.7970681332.

The spelling of 25619431 in words is "twenty-five million, six hundred nineteen thousand, four hundred thirty-one".