250681681 has 2 divisors, whose sum is σ = 250681682. Its totient is φ = 250681680.

The previous prime is 250681661. The next prime is 250681699. The reversal of 250681681 is 186186052.

250681681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153363456 + 97318225 = 12384^2 + 9865^2 .

It is a cyclic number.

It is not a de Polignac number, because 250681681 - 2⁷ = 250681553 is a prime.

It is a super-2 number, since 2×250681681² = 125682610377971522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 250681681.

It is not a weakly prime, because it can be changed into another prime (250681601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125340840 + 125340841.

It is an arithmetic number, because the mean of its divisors is an integer number (125340841).

Almost surely, 2^250681681 is an apocalyptic number.

It is an amenable number.

250681681 is a deficient number, since it is larger than the sum of its proper divisors (1).

250681681 is an equidigital number, since it uses as much as digits as its factorization.

250681681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 250681681 is about 15832.9302720627. The cubic root of 250681681 is about 630.5325814761.

The spelling of 250681681 in words is "two hundred fifty million, six hundred eighty-one thousand, six hundred eighty-one".