743547721 has 4 divisors (see below), whose sum is σ = 849768832. Its totient is φ = 637326612.

The previous prime is 743547719. The next prime is 743547731. The reversal of 743547721 is 127745347.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127745347 = 8581 ⋅14887.

It is a cyclic number.

It is not a de Polignac number, because 743547721 - 2¹ = 743547719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743547731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53110545 + ... + 53110558.

It is an arithmetic number, because the mean of its divisors is an integer number (212442208).

Almost surely, 2^743547721 is an apocalyptic number.

It is an amenable number.

743547721 is a deficient number, since it is larger than the sum of its proper divisors (106221111).

743547721 is a wasteful number, since it uses less digits than its factorization.

743547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106221110.

The product of its digits is 164640, while the sum is 40.

The square root of 743547721 is about 27268.0714572923. The cubic root of 743547721 is about 905.9473290888.

The spelling of 743547721 in words is "seven hundred forty-three million, five hundred forty-seven thousand, seven hundred twenty-one".