722701981 has 4 divisors (see below), whose sum is σ = 722897500. Its totient is φ = 722506464.

The previous prime is 722701951. The next prime is 722701997. The reversal of 722701981 is 189107227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189107227 = 233 ⋅811619.

It can be written as a sum of positive squares in 2 ways, for example, as 270076356 + 452625625 = 16434^2 + 21275^2 .

It is a cyclic number.

It is not a de Polignac number, because 722701981 - 2⁵ = 722701949 is a prime.

It is a super-2 number, since 2×722701981² = 1044596306682648722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722701981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722701921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92106 + ... + 99643.

It is an arithmetic number, because the mean of its divisors is an integer number (180724375).

Almost surely, 2^722701981 is an apocalyptic number.

It is an amenable number.

722701981 is a deficient number, since it is larger than the sum of its proper divisors (195519).

722701981 is a wasteful number, since it uses less digits than its factorization.

722701981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195518.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 722701981 is about 26883.1170253749. The cubic root of 722701981 is about 897.4007229258.

The spelling of 722701981 in words is "seven hundred twenty-two million, seven hundred one thousand, nine hundred eighty-one".