3121111849 has 2 divisors, whose sum is σ = 3121111850. Its totient is φ = 3121111848.

The previous prime is 3121111823. The next prime is 3121111879. The reversal of 3121111849 is 9481111213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1574105625 + 1547006224 = 39675^2 + 39332^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121111849 - 2²¹ = 3119014697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3121111849.

It is not a weakly prime, because it can be changed into another prime (3121111879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560555924 + 1560555925.

It is an arithmetic number, because the mean of its divisors is an integer number (1560555925).

Almost surely, 2^3121111849 is an apocalyptic number.

It is an amenable number.

3121111849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121111849 is an equidigital number, since it uses as much as digits as its factorization.

3121111849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 31.

The square root of 3121111849 is about 55866.9119336303. The cubic root of 3121111849 is about 1461.4022695918.

The spelling of 3121111849 in words is "three billion, one hundred twenty-one million, one hundred eleven thousand, eight hundred forty-nine".