722226761 has 2 divisors, whose sum is σ = 722226762. Its totient is φ = 722226760.

The previous prime is 722226721. The next prime is 722226779. The reversal of 722226761 is 167622227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564347536 + 157879225 = 23756^2 + 12565^2 .

It is a cyclic number.

It is not a de Polignac number, because 722226761 - 2²² = 718032457 is a prime.

It is a super-2 number, since 2×722226761² = 1043222988609102242, which contains 22 as substring.

It is equal to p_37343375 and since 722226761 and 37343375 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (722226721) 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, 361113380 + 361113381.

It is an arithmetic number, because the mean of its divisors is an integer number (361113381).

Almost surely, 2^722226761 is an apocalyptic number.

It is an amenable number.

722226761 is a deficient number, since it is larger than the sum of its proper divisors (1).

722226761 is an equidigital number, since it uses as much as digits as its factorization.

722226761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 722226761 is about 26874.2769391104. The cubic root of 722226761 is about 897.2039814880.

Adding to 722226761 its reverse (167622227), we get a palindrome (889848988).

The spelling of 722226761 in words is "seven hundred twenty-two million, two hundred twenty-six thousand, seven hundred sixty-one".