2130691 has 4 divisors (see below), whose sum is σ = 2150712. Its totient is φ = 2110672.

The previous prime is 2130683. The next prime is 2130701. The reversal of 2130691 is 1960312.

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 2130691 - 2³ = 2130683 is a prime.

It is a Duffinian number.

2130691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2130631) 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, 9850 + ... + 10063.

It is an arithmetic number, because the mean of its divisors is an integer number (537678).

2^2130691 is an apocalyptic number.

2130691 is a deficient number, since it is larger than the sum of its proper divisors (20021).

2130691 is a wasteful number, since it uses less digits than its factorization.

2130691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20020.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2130691 is about 1459.6886654352. The cubic root of 2130691 is about 128.6787471394.

The spelling of 2130691 in words is "two million, one hundred thirty thousand, six hundred ninety-one".