771223681 has 4 divisors (see below), whose sum is σ = 774591700. Its totient is φ = 767855664.

The previous prime is 771223669. The next prime is 771223729. The reversal of 771223681 is 186322177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446899600 + 324324081 = 21140^2 + 18009^2 .

It is a cyclic number.

It is not a de Polignac number, because 771223681 - 2¹⁵ = 771190913 is a prime.

It is a super-3 number, since 3×771223681³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 771223681.

It is not an unprimeable number, because it can be changed into a prime (771223601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683666 + ... + 1684123.

It is an arithmetic number, because the mean of its divisors is an integer number (193647925).

Almost surely, 2^771223681 is an apocalyptic number.

It is an amenable number.

771223681 is a deficient number, since it is larger than the sum of its proper divisors (3368019).

771223681 is a wasteful number, since it uses less digits than its factorization.

771223681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368018.

The product of its digits is 28224, while the sum is 37.

The square root of 771223681 is about 27770.9142989567. The cubic root of 771223681 is about 917.0509226411.

The spelling of 771223681 in words is "seven hundred seventy-one million, two hundred twenty-three thousand, six hundred eighty-one".