2290251721 has 2 divisors, whose sum is σ = 2290251722. Its totient is φ = 2290251720.

The previous prime is 2290251707. The next prime is 2290251731. The reversal of 2290251721 is 1271520922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2278725696 + 11526025 = 47736^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2290251721 - 2⁹ = 2290251209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2290251731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145125860 + 1145125861.

It is an arithmetic number, because the mean of its divisors is an integer number (1145125861).

Almost surely, 2^2290251721 is an apocalyptic number.

It is an amenable number.

2290251721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2290251721 is an equidigital number, since it uses as much as digits as its factorization.

2290251721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2290251721 is about 47856.5744804201. The cubic root of 2290251721 is about 1318.1385840540.

The spelling of 2290251721 in words is "two billion, two hundred ninety million, two hundred fifty-one thousand, seven hundred twenty-one".