249300721 has 2 divisors, whose sum is σ = 249300722. Its totient is φ = 249300720.

The previous prime is 249300683. The next prime is 249300739. The reversal of 249300721 is 127003942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166126321 + 83174400 = 12889^2 + 9120^2 .

It is a cyclic number.

It is not a de Polignac number, because 249300721 - 2¹³ = 249292529 is a prime.

It is a super-2 number, since 2×249300721² = 124301698982239682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 249300721.

It is not a weakly prime, because it can be changed into another prime (249300761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124650360 + 124650361.

It is an arithmetic number, because the mean of its divisors is an integer number (124650361).

Almost surely, 2^249300721 is an apocalyptic number.

It is an amenable number.

249300721 is a deficient number, since it is larger than the sum of its proper divisors (1).

249300721 is an equidigital number, since it uses as much as digits as its factorization.

249300721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 249300721 is about 15789.2596723216. The cubic root of 249300721 is about 629.3726189045.

The spelling of 249300721 in words is "two hundred forty-nine million, three hundred thousand, seven hundred twenty-one".