721914849 has 14 divisors (see below), whose sum is σ = 1082378226. Its totient is φ = 481276080.

The previous prime is 721914833. The next prime is 721914913. The reversal of 721914849 is 948419127.

It is a happy number.

721914849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 721728225 + 186624 = 26865^2 + 432^2 .

It is not a de Polignac number, because 721914849 - 2⁴ = 721914833 is a prime.

It is a super-2 number, since 2×721914849² = 1042322098413385602, which contains 22 as substring.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 72 and 1914849 contains 721914849 itself.

It is not an unprimeable number, because it can be changed into a prime (721914829) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 494412 + ... + 495869.

Almost surely, 2^721914849 is an apocalyptic number.

It is an amenable number.

721914849 is a deficient number, since it is larger than the sum of its proper divisors (360463377).

721914849 is an frugal number, since it uses more digits than its factorization.

721914849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990299 (or 990284 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 721914849 is about 26868.4731423280. The cubic root of 721914849 is about 897.0748027685.

The spelling of 721914849 in words is "seven hundred twenty-one million, nine hundred fourteen thousand, eight hundred forty-nine".