2811878213 has 2 divisors, whose sum is σ = 2811878214. Its totient is φ = 2811878212.

The previous prime is 2811878197. The next prime is 2811878239. The reversal of 2811878213 is 3128781182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2636103649 + 175774564 = 51343^2 + 13258^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811878213 - 2⁴ = 2811878197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2811878263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405939106 + 1405939107.

It is an arithmetic number, because the mean of its divisors is an integer number (1405939107).

Almost surely, 2^2811878213 is an apocalyptic number.

It is an amenable number.

2811878213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811878213 is an equidigital number, since it uses as much as digits as its factorization.

2811878213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 41.

The square root of 2811878213 is about 53027.1460008928. The cubic root of 2811878213 is about 1411.4500136159.

The spelling of 2811878213 in words is "two billion, eight hundred eleven million, eight hundred seventy-eight thousand, two hundred thirteen".