250006721 has 2 divisors, whose sum is σ = 250006722. Its totient is φ = 250006720.

The previous prime is 250006703. The next prime is 250006741. The reversal of 250006721 is 127600052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 45373696 = 14305^2 + 6736^2 .

It is a cyclic number.

It is not a de Polignac number, because 250006721 - 2⁶ = 250006657 is a prime.

It is not a weakly prime, because it can be changed into another prime (250006741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125003360 + 125003361.

It is an arithmetic number, because the mean of its divisors is an integer number (125003361).

Almost surely, 2^250006721 is an apocalyptic number.

It is an amenable number.

250006721 is a deficient number, since it is larger than the sum of its proper divisors (1).

250006721 is an equidigital number, since it uses as much as digits as its factorization.

250006721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 250006721 is about 15811.6008360950. The cubic root of 250006721 is about 629.9661701831.

Adding to 250006721 its reverse (127600052), we get a palindrome (377606773).

The spelling of 250006721 in words is "two hundred fifty million, six thousand, seven hundred twenty-one".