2164391 has 8 divisors (see below), whose sum is σ = 2222640. Its totient is φ = 2107072.

The previous prime is 2164387. The next prime is 2164399. The reversal of 2164391 is 1934612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2164391 - 2² = 2164387 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2164391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7241 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (277830).

2^2164391 is an apocalyptic number.

2164391 is a deficient number, since it is larger than the sum of its proper divisors (58249).

2164391 is an equidigital number, since it uses as much as digits as its factorization.

2164391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 1296, while the sum is 26.

The square root of 2164391 is about 1471.1869357767. The cubic root of 2164391 is about 129.3536158422.

The spelling of 2164391 in words is "two million, one hundred sixty-four thousand, three hundred ninety-one".