244997721 has 6 divisors (see below), whose sum is σ = 353885610. Its totient is φ = 163331808.

The previous prime is 244997689. The next prime is 244997741. The reversal of 244997721 is 127799442.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 175191696 + 69806025 = 13236^2 + 8355^2 .

It is not a de Polignac number, because 244997721 - 2⁵ = 244997689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (244997741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13610976 + ... + 13610993.

It is an arithmetic number, because the mean of its divisors is an integer number (58980935).

Almost surely, 2^244997721 is an apocalyptic number.

It is an amenable number.

244997721 is a deficient number, since it is larger than the sum of its proper divisors (108887889).

244997721 is a wasteful number, since it uses less digits than its factorization.

244997721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27221975 (or 27221972 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 244997721 is about 15652.4030423446. The cubic root of 244997721 is about 625.7305343652.

The spelling of 244997721 in words is "two hundred forty-four million, nine hundred ninety-seven thousand, seven hundred twenty-one".