25641731 has 2 divisors, whose sum is σ = 25641732. Its totient is φ = 25641730.

The previous prime is 25641709. The next prime is 25641739. The reversal of 25641731 is 13714652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25641731 - 2⁶ = 25641667 is a prime.

It is a super-2 number, since 2×25641731² = 1314996737352722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25641694 and 25641703.

It is not a weakly prime, because it can be changed into another prime (25641739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820865 + 12820866.

It is an arithmetic number, because the mean of its divisors is an integer number (12820866).

Almost surely, 2^25641731 is an apocalyptic number.

25641731 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641731 is an equidigital number, since it uses as much as digits as its factorization.

25641731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 25641731 is about 5063.7664835575. The cubic root of 25641731 is about 294.8825770338.

The spelling of 25641731 in words is "twenty-five million, six hundred forty-one thousand, seven hundred thirty-one".