3218684891 has 16 divisors (see below), whose sum is σ = 3352571904. Its totient is φ = 3087764064.

The previous prime is 3218684863. The next prime is 3218684893. The reversal of 3218684891 is 1984868123.

It is a cyclic number.

It is not a de Polignac number, because 3218684891 - 2²⁶ = 3151576027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3218684893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101965 + ... + 1104881.

It is an arithmetic number, because the mean of its divisors is an integer number (209535744).

Almost surely, 2^3218684891 is an apocalyptic number.

3218684891 is a deficient number, since it is larger than the sum of its proper divisors (133887013).

3218684891 is a wasteful number, since it uses less digits than its factorization.

3218684891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its digits is 663552, while the sum is 50.

The square root of 3218684891 is about 56733.4547775825. The cubic root of 3218684891 is about 1476.4751903727.

The spelling of 3218684891 in words is "three billion, two hundred eighteen million, six hundred eighty-four thousand, eight hundred ninety-one".