25256641 has 2 divisors, whose sum is σ = 25256642. Its totient is φ = 25256640.

The previous prime is 25256633. The next prime is 25256653. The reversal of 25256641 is 14665252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24216241 + 1040400 = 4921^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 25256641 - 2³ = 25256633 is a prime.

It is a super-3 number, since 3×25256641³ (a number of 23 digits) contains 333 as substring.

It is equal to p_1580890 and since 25256641 and 1580890 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (23256641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628320 + 12628321.

It is an arithmetic number, because the mean of its divisors is an integer number (12628321).

Almost surely, 2^25256641 is an apocalyptic number.

It is an amenable number.

25256641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256641 is an equidigital number, since it uses as much as digits as its factorization.

25256641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 25256641 is about 5025.5985713147. The cubic root of 25256641 is about 293.3989331877.

The spelling of 25256641 in words is "twenty-five million, two hundred fifty-six thousand, six hundred forty-one".