3081806221 has 4 divisors (see below), whose sum is σ = 3318868252. Its totient is φ = 2844744192.

The previous prime is 3081806219. The next prime is 3081806243. The reversal of 3081806221 is 1226081803.

3081806221 is nontrivially palindromic in base 6.

3081806221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226081803 = 17 ⋅72122459.

It can be written as a sum of positive squares in 2 ways, for example, as 454116100 + 2627690121 = 21310^2 + 51261^2 .

It is a cyclic number.

It is not a de Polignac number, because 3081806221 - 2¹ = 3081806219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3081807221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118530996 + ... + 118531021.

It is an arithmetic number, because the mean of its divisors is an integer number (829717063).

Almost surely, 2^3081806221 is an apocalyptic number.

It is an amenable number.

3081806221 is a deficient number, since it is larger than the sum of its proper divisors (237062031).

3081806221 is a wasteful number, since it uses less digits than its factorization.

3081806221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237062030.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 3081806221 is about 55514.0182386395. The cubic root of 3081806221 is about 1455.2416269909.

The spelling of 3081806221 in words is "three billion, eighty-one million, eight hundred six thousand, two hundred twenty-one".