25809671 has 2 divisors, whose sum is σ = 25809672. Its totient is φ = 25809670.

The previous prime is 25809629. The next prime is 25809677. The reversal of 25809671 is 17690852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25809671 - 2⁶ = 25809607 is a prime.

It is a super-2 number, since 2×25809671² = 1332278234256482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25809677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12904835 + 12904836.

It is an arithmetic number, because the mean of its divisors is an integer number (12904836).

Almost surely, 2^25809671 is an apocalyptic number.

25809671 is a deficient number, since it is larger than the sum of its proper divisors (1).

25809671 is an equidigital number, since it uses as much as digits as its factorization.

25809671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 25809671 is about 5080.3219386177. The cubic root of 25809671 is about 295.5249524901.

The spelling of 25809671 in words is "twenty-five million, eight hundred nine thousand, six hundred seventy-one".