722981521 has 8 divisors (see below), whose sum is σ = 761698080. Its totient is φ = 684331488.

The previous prime is 722981503. The next prime is 722981531. The reversal of 722981521 is 125189227.

722981521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722981521 - 2⁷ = 722981393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722981531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6525 + ... + 38581.

It is an arithmetic number, because the mean of its divisors is an integer number (95212260).

Almost surely, 2^722981521 is an apocalyptic number.

It is an amenable number.

722981521 is a deficient number, since it is larger than the sum of its proper divisors (38716559).

722981521 is a wasteful number, since it uses less digits than its factorization.

722981521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33263.

The product of its digits is 20160, while the sum is 37.

The square root of 722981521 is about 26888.3156965995. The cubic root of 722981521 is about 897.5164124113.

The spelling of 722981521 in words is "seven hundred twenty-two million, nine hundred eighty-one thousand, five hundred twenty-one".