2133861 has 4 divisors (see below), whose sum is σ = 2845152. Its totient is φ = 1422572.

The previous prime is 2133839. The next prime is 2133899. The reversal of 2133861 is 1683312.

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 2133861 - 2⁶ = 2133797 is a prime.

It is a D-number.

2133861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133811) 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, 355641 + ... + 355646.

It is an arithmetic number, because the mean of its divisors is an integer number (711288).

2^2133861 is an apocalyptic number.

It is an amenable number.

2133861 is a deficient number, since it is larger than the sum of its proper divisors (711291).

2133861 is an equidigital number, since it uses as much as digits as its factorization.

2133861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711290.

The product of its digits is 864, while the sum is 24.

The square root of 2133861 is about 1460.7741098472. The cubic root of 2133861 is about 128.7425307509.

The spelling of 2133861 in words is "two million, one hundred thirty-three thousand, eight hundred sixty-one".