943693730721 has 81 divisors (see below), whose sum is σ = 1600993780659. Its totient is φ = 534089390688.

The previous prime is 943693730711. The next prime is 943693730797. The reversal of 943693730721 is 127037396349.

The square root of 943693730721 is 971439.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 162654923025 + 781038807696 = 403305^2 + 883764^2 .

It is not a de Polignac number, because 943693730721 - 2³⁹ = 393937916833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (943693730711) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 3406836435 + ... + 3406836711.

Almost surely, 2^943693730721 is an apocalyptic number.

943693730721 is the 971439-th square number.

943693730721 is the 485720-th centered octagonal number.

It is an amenable number.

943693730721 is a deficient number, since it is larger than the sum of its proper divisors (657300049938).

943693730721 is an equidigital number, since it uses as much as digits as its factorization.

943693730721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 54.

The spelling of 943693730721 in words is "nine hundred forty-three billion, six hundred ninety-three million, seven hundred thirty thousand, seven hundred twenty-one".