2131091 has 4 divisors (see below), whose sum is σ = 2142000. Its totient is φ = 2120184.

The previous prime is 2131081. The next prime is 2131093. The reversal of 2131091 is 1901312.

It is a happy number.

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 2131091 - 2¹⁸ = 1868947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5156 + ... + 5553.

It is an arithmetic number, because the mean of its divisors is an integer number (535500).

2^2131091 is an apocalyptic number.

2131091 is a deficient number, since it is larger than the sum of its proper divisors (10909).

2131091 is a wasteful number, since it uses less digits than its factorization.

2131091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10908.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 2131091 is about 1459.8256745242. The cubic root of 2131091 is about 128.6867990309.

The spelling of 2131091 in words is "two million, one hundred thirty-one thousand, ninety-one".