25917971 has 2 divisors, whose sum is σ = 25917972. Its totient is φ = 25917970.

The previous prime is 25917961. The next prime is 25918001. The reversal of 25917971 is 17971952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25917971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25917961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12958985 + 12958986.

It is an arithmetic number, because the mean of its divisors is an integer number (12958986).

Almost surely, 2^25917971 is an apocalyptic number.

25917971 is a deficient number, since it is larger than the sum of its proper divisors (1).

25917971 is an equidigital number, since it uses as much as digits as its factorization.

25917971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 25917971 is about 5090.9695540241. The cubic root of 25917971 is about 295.9377265819.

The spelling of 25917971 in words is "twenty-five million, nine hundred seventeen thousand, nine hundred seventy-one".