744291521 has 4 divisors (see below), whose sum is σ = 746978772. Its totient is φ = 741604272.

The previous prime is 744291517. The next prime is 744291529. The reversal of 744291521 is 125192447.

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 281568400 + 462723121 = 16780^2 + 21511^2 .

It is a cyclic number.

It is not a de Polignac number, because 744291521 - 2² = 744291517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (744291529) 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, 1343210 + ... + 1343763.

It is an arithmetic number, because the mean of its divisors is an integer number (186744693).

Almost surely, 2^744291521 is an apocalyptic number.

It is an amenable number.

744291521 is a deficient number, since it is larger than the sum of its proper divisors (2687251).

744291521 is a wasteful number, since it uses less digits than its factorization.

744291521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687250.

The product of its digits is 20160, while the sum is 35.

The square root of 744291521 is about 27281.7067098083. The cubic root of 744291521 is about 906.2493133185.

The spelling of 744291521 in words is "seven hundred forty-four million, two hundred ninety-one thousand, five hundred twenty-one".