2923721681 has 8 divisors (see below), whose sum is σ = 3040216680. Its totient is φ = 2808271872.

The previous prime is 2923721663. The next prime is 2923721683. The reversal of 2923721681 is 1861273292.

2923721681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 977500225 + 1946221456 = 31265^2 + 44116^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2923721681 - 2⁶ = 2923721617 is a prime.

It is a super-2 number, since 2×2923721681² = 17096296935898931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2923721683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255590 + ... + 266783.

It is an arithmetic number, because the mean of its divisors is an integer number (380027085).

Almost surely, 2^2923721681 is an apocalyptic number.

It is an amenable number.

2923721681 is a deficient number, since it is larger than the sum of its proper divisors (116494999).

2923721681 is a wasteful number, since it uses less digits than its factorization.

2923721681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522595.

The product of its digits is 72576, while the sum is 41.

The square root of 2923721681 is about 54071.4497771236. The cubic root of 2923721681 is about 1429.9208851531.

The spelling of 2923721681 in words is "two billion, nine hundred twenty-three million, seven hundred twenty-one thousand, six hundred eighty-one".