722235781 has 2 divisors, whose sum is σ = 722235782. Its totient is φ = 722235780.

The previous prime is 722235779. The next prime is 722235859. The reversal of 722235781 is 187532227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654848100 + 67387681 = 25590^2 + 8209^2 .

It is a cyclic number.

It is not a de Polignac number, because 722235781 - 2¹ = 722235779 is a prime.

It is a super-2 number, since 2×722235781² = 1043249046713359922, which contains 22 as substring.

Together with 722235779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 722235781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722230781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361117890 + 361117891.

It is an arithmetic number, because the mean of its divisors is an integer number (361117891).

Almost surely, 2^722235781 is an apocalyptic number.

It is an amenable number.

722235781 is a deficient number, since it is larger than the sum of its proper divisors (1).

722235781 is an equidigital number, since it uses as much as digits as its factorization.

722235781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 722235781 is about 26874.4447570550. Note that the first 3 decimals coincide. The cubic root of 722235781 is about 897.2077165781.

The spelling of 722235781 in words is "seven hundred twenty-two million, two hundred thirty-five thousand, seven hundred eighty-one".