250881649 has 2 divisors, whose sum is σ = 250881650. Its totient is φ = 250881648.

The previous prime is 250881647. The next prime is 250881671. The reversal of 250881649 is 946188052.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164019249 + 86862400 = 12807^2 + 9320^2 .

It is a cyclic number.

It is not a de Polignac number, because 250881649 - 2¹ = 250881647 is a prime.

Together with 250881647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (250881641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125440824 + 125440825.

It is an arithmetic number, because the mean of its divisors is an integer number (125440825).

Almost surely, 2^250881649 is an apocalyptic number.

It is an amenable number.

250881649 is a deficient number, since it is larger than the sum of its proper divisors (1).

250881649 is an equidigital number, since it uses as much as digits as its factorization.

250881649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 250881649 is about 15839.2439529164. The cubic root of 250881649 is about 630.7001948778.

The spelling of 250881649 in words is "two hundred fifty million, eight hundred eighty-one thousand, six hundred forty-nine".