250402721 has 2 divisors, whose sum is σ = 250402722. Its totient is φ = 250402720.

The previous prime is 250402697. The next prime is 250402723. The reversal of 250402721 is 127204052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250272400 + 130321 = 15820^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 250402721 - 2¹⁸ = 250140577 is a prime.

Together with 250402723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (250402723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125201360 + 125201361.

It is an arithmetic number, because the mean of its divisors is an integer number (125201361).

Almost surely, 2^250402721 is an apocalyptic number.

It is an amenable number.

250402721 is a deficient number, since it is larger than the sum of its proper divisors (1).

250402721 is an equidigital number, since it uses as much as digits as its factorization.

250402721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 250402721 is about 15824.1183324696. The cubic root of 250402721 is about 630.2986079183.

Adding to 250402721 its reverse (127204052), we get a palindrome (377606773).

The spelling of 250402721 in words is "two hundred fifty million, four hundred two thousand, seven hundred twenty-one".