25990631 has 2 divisors, whose sum is σ = 25990632. Its totient is φ = 25990630.

The previous prime is 25990609. The next prime is 25990661. The reversal of 25990631 is 13609952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25990631 - 2⁶ = 25990567 is a prime.

It is a super-2 number, since 2×25990631² = 1351025799556322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25990591 and 25990600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25990661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995315 + 12995316.

It is an arithmetic number, because the mean of its divisors is an integer number (12995316).

Almost surely, 2^25990631 is an apocalyptic number.

25990631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25990631 is an equidigital number, since it uses as much as digits as its factorization.

25990631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 25990631 is about 5098.1007247798. The cubic root of 25990631 is about 296.2140184302.

The spelling of 25990631 in words is "twenty-five million, nine hundred ninety thousand, six hundred thirty-one".