2133691 has 4 divisors (see below), whose sum is σ = 2438512. Its totient is φ = 1828872.

The previous prime is 2133689. The next prime is 2133697. The reversal of 2133691 is 1963312.

2133691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2133691 - 2¹ = 2133689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2133697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152400 + ... + 152413.

It is an arithmetic number, because the mean of its divisors is an integer number (609628).

2^2133691 is an apocalyptic number.

2133691 is a deficient number, since it is larger than the sum of its proper divisors (304821).

2133691 is an equidigital number, since it uses as much as digits as its factorization.

2133691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304820.

The product of its digits is 972, while the sum is 25.

The square root of 2133691 is about 1460.7159203623. The cubic root of 2133691 is about 128.7391117823.

The spelling of 2133691 in words is "two million, one hundred thirty-three thousand, six hundred ninety-one".