2164491 has 48 divisors (see below), whose sum is σ = 3953664. Its totient is φ = 1112832.

The previous prime is 2164489. The next prime is 2164493. The reversal of 2164491 is 1944612.

2164491 is a `hidden beast` number, since 216 + 449 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2164489) and next prime (2164493).

It is not a de Polignac number, because 2164491 - 2¹ = 2164489 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 6⁵ + 4⁴ + 4⁴ + 9⁵ + 1 .

It is not an unprimeable number, because it can be changed into a prime (2164493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46030 + ... + 46076.

It is an arithmetic number, because the mean of its divisors is an integer number (82368).

2^2164491 is an apocalyptic number.

2164491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2164491 is a deficient number, since it is larger than the sum of its proper divisors (1789173).

2164491 is a wasteful number, since it uses less digits than its factorization.

2164491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 117 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 2164491 is about 1471.2209215478. The cubic root of 2164491 is about 129.3556079595.

The spelling of 2164491 in words is "two million, one hundred sixty-four thousand, four hundred ninety-one".