622951681 has 9 divisors (see below), whose sum is σ = 685033923. Its totient is φ = 566070120.

The previous prime is 622951661. The next prime is 622951691. The reversal of 622951681 is 186159226.

The square root of 622951681 is 24959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 26615281 + 596336400 = 5159^2 + 24420^2 .

It is not a de Polignac number, because 622951681 - 2¹⁷ = 622820609 is a prime.

It is a super-2 number, since 2×622951681² = 776137593721451522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622951601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 273415 + ... + 275683.

Almost surely, 2^622951681 is an apocalyptic number.

622951681 is the 24959-th square number.

622951681 is the 12480-th centered octagonal number.

It is an amenable number.

622951681 is a deficient number, since it is larger than the sum of its proper divisors (62082242).

622951681 is an frugal number, since it uses more digits than its factorization.

622951681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560 (or 2280 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The cubic root of 622951681 is about 854.0529307927.

The spelling of 622951681 in words is "six hundred twenty-two million, nine hundred fifty-one thousand, six hundred eighty-one".