2856331861 has 2 divisors, whose sum is σ = 2856331862. Its totient is φ = 2856331860.

The previous prime is 2856331853. The next prime is 2856331879. The reversal of 2856331861 is 1681336582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2640418225 + 215913636 = 51385^2 + 14694^2 .

It is a cyclic number.

It is not a de Polignac number, because 2856331861 - 2³ = 2856331853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2856331801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428165930 + 1428165931.

It is an arithmetic number, because the mean of its divisors is an integer number (1428165931).

Almost surely, 2^2856331861 is an apocalyptic number.

It is an amenable number.

2856331861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856331861 is an equidigital number, since it uses as much as digits as its factorization.

2856331861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 2856331861 is about 53444.6616698057. The cubic root of 2856331861 is about 1418.8491404234.

The spelling of 2856331861 in words is "two billion, eight hundred fifty-six million, three hundred thirty-one thousand, eight hundred sixty-one".