25258781 has 2 divisors, whose sum is σ = 25258782. Its totient is φ = 25258780.

The previous prime is 25258763. The next prime is 25258813. The reversal of 25258781 is 18785252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22714756 + 2544025 = 4766^2 + 1595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25258781 is a prime.

It is a super-3 number, since 3×25258781³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25258711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12629390 + 12629391.

It is an arithmetic number, because the mean of its divisors is an integer number (12629391).

Almost surely, 2^25258781 is an apocalyptic number.

It is an amenable number.

25258781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25258781 is an equidigital number, since it uses as much as digits as its factorization.

25258781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 38.

The square root of 25258781 is about 5025.8114767667. The cubic root of 25258781 is about 293.4072195362.

The spelling of 25258781 in words is "twenty-five million, two hundred fifty-eight thousand, seven hundred eighty-one".