250648721 has 2 divisors, whose sum is σ = 250648722. Its totient is φ = 250648720.

The previous prime is 250648691. The next prime is 250648753. The reversal of 250648721 is 127846052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196420225 + 54228496 = 14015^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 250648721 - 2²⁶ = 183539857 is a prime.

It is not a weakly prime, because it can be changed into another prime (250648781) 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, 125324360 + 125324361.

It is an arithmetic number, because the mean of its divisors is an integer number (125324361).

Almost surely, 2^250648721 is an apocalyptic number.

It is an amenable number.

250648721 is a deficient number, since it is larger than the sum of its proper divisors (1).

250648721 is an equidigital number, since it uses as much as digits as its factorization.

250648721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 250648721 is about 15831.8893692446. The cubic root of 250648721 is about 630.5049458112.

The spelling of 250648721 in words is "two hundred fifty million, six hundred forty-eight thousand, seven hundred twenty-one".