2135791 has 4 divisors (see below), whose sum is σ = 2440912. Its totient is φ = 1830672.

The previous prime is 2135779. The next prime is 2135797. The reversal of 2135791 is 1975312.

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

It is a cyclic number.

It is not a de Polignac number, because 2135791 - 2⁷ = 2135663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135797) 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, 152550 + ... + 152563.

It is an arithmetic number, because the mean of its divisors is an integer number (610228).

2^2135791 is an apocalyptic number.

2135791 is a deficient number, since it is larger than the sum of its proper divisors (305121).

2135791 is an equidigital number, since it uses as much as digits as its factorization.

2135791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305120.

The product of its digits is 1890, while the sum is 28.

The square root of 2135791 is about 1461.4345691819. The cubic root of 2135791 is about 128.7813333737.

It can be divided in two parts, 2135 and 791, that added together give a triangular number (2926 = T₇₆).

The spelling of 2135791 in words is "two million, one hundred thirty-five thousand, seven hundred ninety-one".