2135811 has 4 divisors (see below), whose sum is σ = 2847752. Its totient is φ = 1423872.

The previous prime is 2135797. The next prime is 2135831. The reversal of 2135811 is 1185312.

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

It is not a de Polignac number, because 2135811 - 2⁵ = 2135779 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2135831) 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, 355966 + ... + 355971.

It is an arithmetic number, because the mean of its divisors is an integer number (711938).

2^2135811 is an apocalyptic number.

2135811 is a deficient number, since it is larger than the sum of its proper divisors (711941).

2135811 is an equidigital number, since it uses as much as digits as its factorization.

2135811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711940.

The product of its digits is 240, while the sum is 21.

The square root of 2135811 is about 1461.4414117576. The cubic root of 2135811 is about 128.7817353510.

The spelling of 2135811 in words is "two million, one hundred thirty-five thousand, eight hundred eleven".