25730681 has 2 divisors, whose sum is σ = 25730682. Its totient is φ = 25730680.

The previous prime is 25730647. The next prime is 25730687. The reversal of 25730681 is 18603752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 379456 = 5035^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 25730681 - 2¹⁰ = 25729657 is a prime.

It is a super-2 number, since 2×25730681² = 1324135889447522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25730687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12865340 + 12865341.

It is an arithmetic number, because the mean of its divisors is an integer number (12865341).

Almost surely, 2^25730681 is an apocalyptic number.

It is an amenable number.

25730681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25730681 is an equidigital number, since it uses as much as digits as its factorization.

25730681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 25730681 is about 5072.5418677424. The cubic root of 25730681 is about 295.2231616007.

The spelling of 25730681 in words is "twenty-five million, seven hundred thirty thousand, six hundred eighty-one".