2111679491 has 4 divisors (see below), whose sum is σ = 2112281400. Its totient is φ = 2111077584.

The previous prime is 2111679487. The next prime is 2111679527. The reversal of 2111679491 is 1949761112.

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 2111679491 - 2² = 2111679487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111679461) 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, 295661 + ... + 302718.

It is an arithmetic number, because the mean of its divisors is an integer number (528070350).

Almost surely, 2^2111679491 is an apocalyptic number.

2111679491 is a deficient number, since it is larger than the sum of its proper divisors (601909).

2111679491 is an equidigital number, since it uses as much as digits as its factorization.

2111679491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601908.

The product of its digits is 27216, while the sum is 41.

The square root of 2111679491 is about 45953.0139490328. The cubic root of 2111679491 is about 1282.9488269713.

The spelling of 2111679491 in words is "two billion, one hundred eleven million, six hundred seventy-nine thousand, four hundred ninety-one".