25744781 has 2 divisors, whose sum is σ = 25744782. Its totient is φ = 25744780.

The previous prime is 25744769. The next prime is 25744801. The reversal of 25744781 is 18744752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 10023556 = 3965^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 25744781 - 2⁶ = 25744717 is a prime.

It is a super-2 number, since 2×25744781² = 1325587497475922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25704781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12872390 + 12872391.

It is an arithmetic number, because the mean of its divisors is an integer number (12872391).

Almost surely, 2^25744781 is an apocalyptic number.

It is an amenable number.

25744781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25744781 is an equidigital number, since it uses as much as digits as its factorization.

25744781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 25744781 is about 5073.9315131365. The cubic root of 25744781 is about 295.2770776042.

The spelling of 25744781 in words is "twenty-five million, seven hundred forty-four thousand, seven hundred eighty-one".