2857279861 has 2 divisors, whose sum is σ = 2857279862. Its totient is φ = 2857279860.

The previous prime is 2857279849. The next prime is 2857279871. The reversal of 2857279861 is 1689727582.

2857279861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2842915761 + 14364100 = 53319^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857279861 - 2⁵ = 2857279829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2857279871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428639930 + 1428639931.

It is an arithmetic number, because the mean of its divisors is an integer number (1428639931).

Almost surely, 2^2857279861 is an apocalyptic number.

It is an amenable number.

2857279861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857279861 is an equidigital number, since it uses as much as digits as its factorization.

2857279861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 2857279861 is about 53453.5299208574. The cubic root of 2857279861 is about 1419.0060923313.

The spelling of 2857279861 in words is "two billion, eight hundred fifty-seven million, two hundred seventy-nine thousand, eight hundred sixty-one".