721935241 has 2 divisors, whose sum is σ = 721935242. Its totient is φ = 721935240.

The previous prime is 721935211. The next prime is 721935287. The reversal of 721935241 is 142539127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606587641 + 115347600 = 24629^2 + 10740^2 .

It is a cyclic number.

It is not a de Polignac number, because 721935241 - 2⁷ = 721935113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721935197 and 721935206.

It is not a weakly prime, because it can be changed into another prime (721935211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360967620 + 360967621.

It is an arithmetic number, because the mean of its divisors is an integer number (360967621).

Almost surely, 2^721935241 is an apocalyptic number.

It is an amenable number.

721935241 is a deficient number, since it is larger than the sum of its proper divisors (1).

721935241 is an equidigital number, since it uses as much as digits as its factorization.

721935241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 721935241 is about 26868.8526178547. The cubic root of 721935241 is about 897.0832492758.

The spelling of 721935241 in words is "seven hundred twenty-one million, nine hundred thirty-five thousand, two hundred forty-one".