1044013721 has 2 divisors, whose sum is σ = 1044013722. Its totient is φ = 1044013720.

The previous prime is 1044013703. The next prime is 1044013777. The reversal of 1044013721 is 1273104401.

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., 969450496 + 74563225 = 31136^2 + 8635^2 .

It is an emirp because it is prime and its reverse (1273104401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1044013721 - 2⁶ = 1044013657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1044013781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522006860 + 522006861.

It is an arithmetic number, because the mean of its divisors is an integer number (522006861).

Almost surely, 2^1044013721 is an apocalyptic number.

It is an amenable number.

1044013721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1044013721 is an equidigital number, since it uses as much as digits as its factorization.

1044013721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1044013721 is about 32311.2011692540. The cubic root of 1044013721 is about 1014.4611086176.

The spelling of 1044013721 in words is "one billion, forty-four million, thirteen thousand, seven hundred twenty-one".