3121485811 has 2 divisors, whose sum is σ = 3121485812. Its totient is φ = 3121485810.

The previous prime is 3121485803. The next prime is 3121485823. The reversal of 3121485811 is 1185841213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3121485811 - 2³ = 3121485803 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121485611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560742905 + 1560742906.

It is an arithmetic number, because the mean of its divisors is an integer number (1560742906).

Almost surely, 2^3121485811 is an apocalyptic number.

3121485811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121485811 is an equidigital number, since it uses as much as digits as its factorization.

3121485811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 34.

The square root of 3121485811 is about 55870.2587339633. The cubic root of 3121485811 is about 1461.4606341658.

The spelling of 3121485811 in words is "three billion, one hundred twenty-one million, four hundred eighty-five thousand, eight hundred eleven".