721996911 has 6 divisors (see below), whose sum is σ = 1042884440. Its totient is φ = 481331268.

The previous prime is 721996909. The next prime is 721996931. The reversal of 721996911 is 119699127.

721996911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721996911 - 2¹ = 721996909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721996931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40110931 + ... + 40110948.

Almost surely, 2^721996911 is an apocalyptic number.

721996911 is a deficient number, since it is larger than the sum of its proper divisors (320887529).

721996911 is a wasteful number, since it uses less digits than its factorization.

721996911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80221885 (or 80221882 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 721996911 is about 26870.0002046892. Note that the first 3 decimals coincide. The cubic root of 721996911 is about 897.1087924481.

The spelling of 721996911 in words is "seven hundred twenty-one million, nine hundred ninety-six thousand, nine hundred eleven".