2179491 has 4 divisors (see below), whose sum is σ = 2905992. Its totient is φ = 1452992.

The previous prime is 2179477. The next prime is 2179523. The reversal of 2179491 is 1949712.

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 2179491 - 2⁵ = 2179459 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 7³ + 9⁴ + 4⁷ + 9⁵ + 1 .

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2179291) 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, 363246 + ... + 363251.

It is an arithmetic number, because the mean of its divisors is an integer number (726498).

2^2179491 is an apocalyptic number.

2179491 is a deficient number, since it is larger than the sum of its proper divisors (726501).

2179491 is an equidigital number, since it uses as much as digits as its factorization.

2179491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726500.

The product of its digits is 4536, while the sum is 33.

The square root of 2179491 is about 1476.3099268108. The cubic root of 2179491 is about 129.6537333389.

The spelling of 2179491 in words is "two million, one hundred seventy-nine thousand, four hundred ninety-one".