25981447 has 2 divisors, whose sum is σ = 25981448. Its totient is φ = 25981446.

The previous prime is 25981429. The next prime is 25981469. The reversal of 25981447 is 74418952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25981447 - 2¹⁵ = 25948679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25981427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990723 + 12990724.

It is an arithmetic number, because the mean of its divisors is an integer number (12990724).

Almost surely, 2^25981447 is an apocalyptic number.

25981447 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981447 is an equidigital number, since it uses as much as digits as its factorization.

25981447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 25981447 is about 5097.1999176018. The cubic root of 25981447 is about 296.1791244456.

The spelling of 25981447 in words is "twenty-five million, nine hundred eighty-one thousand, four hundred forty-seven".