3121678811 has 4 divisors (see below), whose sum is σ = 3152586624. Its totient is φ = 3090771000.

The previous prime is 3121678801. The next prime is 3121678829. The reversal of 3121678811 is 1188761213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121678811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121678801) 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, 15453755 + ... + 15453956.

It is an arithmetic number, because the mean of its divisors is an integer number (788146656).

Almost surely, 2^3121678811 is an apocalyptic number.

3121678811 is a deficient number, since it is larger than the sum of its proper divisors (30907813).

3121678811 is a wasteful number, since it uses less digits than its factorization.

3121678811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30907812.

The product of its digits is 16128, while the sum is 38.

The square root of 3121678811 is about 55871.9859231798. The cubic root of 3121678811 is about 1461.4907540196.

The spelling of 3121678811 in words is "three billion, one hundred twenty-one million, six hundred seventy-eight thousand, eight hundred eleven".