25881517 has 2 divisors, whose sum is σ = 25881518. Its totient is φ = 25881516.

The previous prime is 25881469. The next prime is 25881523. The reversal of 25881517 is 71518852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 741321 = 5014^2 + 861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25881517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25881547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12940758 + 12940759.

It is an arithmetic number, because the mean of its divisors is an integer number (12940759).

Almost surely, 2^25881517 is an apocalyptic number.

It is an amenable number.

25881517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25881517 is an equidigital number, since it uses as much as digits as its factorization.

25881517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 25881517 is about 5087.3880331659. The cubic root of 25881517 is about 295.7989145877.

The spelling of 25881517 in words is "twenty-five million, eight hundred eighty-one thousand, five hundred seventeen".