2011857 has 4 divisors (see below), whose sum is σ = 2682480. Its totient is φ = 1341236.

The previous prime is 2011843. The next prime is 2011861. The reversal of 2011857 is 7581102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011857 - 2⁸ = 2011601 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2011897) 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, 335307 + ... + 335312.

It is an arithmetic number, because the mean of its divisors is an integer number (670620).

2^2011857 is an apocalyptic number.

It is an amenable number.

2011857 is a deficient number, since it is larger than the sum of its proper divisors (670623).

2011857 is an equidigital number, since it uses as much as digits as its factorization.

2011857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670622.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 2011857 is about 1418.3994500845. The cubic root of 2011857 is about 126.2405959731.

Adding to 2011857 its reverse (7581102), we get a palindrome (9592959).

The spelling of 2011857 in words is "two million, eleven thousand, eight hundred fifty-seven".