2856823891 has 2 divisors, whose sum is σ = 2856823892. Its totient is φ = 2856823890.

The previous prime is 2856823883. The next prime is 2856823897. The reversal of 2856823891 is 1983286582.

2856823891 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 is a cyclic number.

It is not a de Polignac number, because 2856823891 - 2³ = 2856823883 is a prime.

It is a super-2 number, since 2×2856823891² = 16322885488376759762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2856823897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428411945 + 1428411946.

It is an arithmetic number, because the mean of its divisors is an integer number (1428411946).

Almost surely, 2^2856823891 is an apocalyptic number.

2856823891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856823891 is an equidigital number, since it uses as much as digits as its factorization.

2856823891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 52.

The square root of 2856823891 is about 53449.2646441464. The cubic root of 2856823891 is about 1418.9306057776.

The spelling of 2856823891 in words is "two billion, eight hundred fifty-six million, eight hundred twenty-three thousand, eight hundred ninety-one".