25900981 has 2 divisors, whose sum is σ = 25900982. Its totient is φ = 25900980.

The previous prime is 25900961. The next prime is 25901003. The reversal of 25900981 is 18900952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22714756 + 3186225 = 4766^2 + 1785^2 .

It is a cyclic number.

It is not a de Polignac number, because 25900981 - 2⁵ = 25900949 is a prime.

It is a super-2 number, since 2×25900981² = 1341721633524722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25900951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12950490 + 12950491.

It is an arithmetic number, because the mean of its divisors is an integer number (12950491).

Almost surely, 2^25900981 is an apocalyptic number.

It is an amenable number.

25900981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25900981 is an equidigital number, since it uses as much as digits as its factorization.

25900981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 25900981 is about 5089.3006395771. The cubic root of 25900981 is about 295.8730471228.

The spelling of 25900981 in words is "twenty-five million, nine hundred thousand, nine hundred eighty-one".