744969721 has 2 divisors, whose sum is σ = 744969722. Its totient is φ = 744969720.

The previous prime is 744969703. The next prime is 744969739. The reversal of 744969721 is 127969447.

It is a balanced prime because it is at equal distance from previous prime (744969703) and next prime (744969739).

It can be written as a sum of positive squares in only one way, i.e., 531809721 + 213160000 = 23061^2 + 14600^2 .

It is a cyclic number.

It is not a de Polignac number, because 744969721 - 2¹¹ = 744967673 is a prime.

It is not a weakly prime, because it can be changed into another prime (744969751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372484860 + 372484861.

It is an arithmetic number, because the mean of its divisors is an integer number (372484861).

Almost surely, 2^744969721 is an apocalyptic number.

It is an amenable number.

744969721 is a deficient number, since it is larger than the sum of its proper divisors (1).

744969721 is an equidigital number, since it uses as much as digits as its factorization.

744969721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 744969721 is about 27294.1334539128. The cubic root of 744969721 is about 906.5244885158.

The spelling of 744969721 in words is "seven hundred forty-four million, nine hundred sixty-nine thousand, seven hundred twenty-one".