743550721 has 4 divisors (see below), whose sum is σ = 743645700. Its totient is φ = 743455744.

The previous prime is 743550697. The next prime is 743550733. The reversal of 743550721 is 127055347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127055347 = 197 ⋅644951.

It can be written as a sum of positive squares in 2 ways, for example, as 206238321 + 537312400 = 14361^2 + 23180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743550721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743556721) 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, 34576 + ... + 51793.

It is an arithmetic number, because the mean of its divisors is an integer number (185911425).

Almost surely, 2^743550721 is an apocalyptic number.

It is an amenable number.

743550721 is a deficient number, since it is larger than the sum of its proper divisors (94979).

743550721 is an equidigital number, since it uses as much as digits as its factorization.

743550721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94978.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 743550721 is about 27268.1264666277. The cubic root of 743550721 is about 905.9485474990.

The spelling of 743550721 in words is "seven hundred forty-three million, five hundred fifty thousand, seven hundred twenty-one".