2855991 has 4 divisors (see below), whose sum is σ = 3807992. Its totient is φ = 1903992.

The previous prime is 2855989. The next prime is 2856001. The reversal of 2855991 is 1995582.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2855991 - 2¹ = 2855989 is a prime.

It is a D-number.

It is a Duffinian number.

2855991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2855911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475996 + ... + 476001.

It is an arithmetic number, because the mean of its divisors is an integer number (951998).

2^2855991 is an apocalyptic number.

2855991 is a deficient number, since it is larger than the sum of its proper divisors (952001).

2855991 is an equidigital number, since it uses as much as digits as its factorization.

2855991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952000.

The product of its digits is 32400, while the sum is 39.

The square root of 2855991 is about 1689.9677511716. The cubic root of 2855991 is about 141.8792698619.

The spelling of 2855991 in words is "two million, eight hundred fifty-five thousand, nine hundred ninety-one".