744211561 has 4 divisors (see below), whose sum is σ = 751039300. Its totient is φ = 737383824.

The previous prime is 744211549. The next prime is 744211603. The reversal of 744211561 is 165112447.

744211561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318408336 + 425803225 = 17844^2 + 20635^2 .

It is a cyclic number.

It is not a de Polignac number, because 744211561 - 2²¹ = 742114409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (744211861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3413706 + ... + 3413923.

It is an arithmetic number, because the mean of its divisors is an integer number (187759825).

Almost surely, 2^744211561 is an apocalyptic number.

It is an amenable number.

744211561 is a deficient number, since it is larger than the sum of its proper divisors (6827739).

744211561 is a wasteful number, since it uses less digits than its factorization.

744211561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6827738.

The product of its digits is 6720, while the sum is 31.

The square root of 744211561 is about 27280.2412196080. The cubic root of 744211561 is about 906.2168590592.

The spelling of 744211561 in words is "seven hundred forty-four million, two hundred eleven thousand, five hundred sixty-one".