250640681 has 2 divisors, whose sum is σ = 250640682. Its totient is φ = 250640680.

The previous prime is 250640653. The next prime is 250640711. The reversal of 250640681 is 186046052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146192281 + 104448400 = 12091^2 + 10220^2 .

It is a cyclic number.

It is not a de Polignac number, because 250640681 - 2²² = 246446377 is a prime.

It is a super-2 number, since 2×250640681² = 125641501944287522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (250640651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125320340 + 125320341.

It is an arithmetic number, because the mean of its divisors is an integer number (125320341).

Almost surely, 2^250640681 is an apocalyptic number.

It is an amenable number.

250640681 is a deficient number, since it is larger than the sum of its proper divisors (1).

250640681 is an equidigital number, since it uses as much as digits as its factorization.

250640681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 250640681 is about 15831.6354493148. The cubic root of 250640681 is about 630.4982042196.

The spelling of 250640681 in words is "two hundred fifty million, six hundred forty thousand, six hundred eighty-one".