2018691 has 6 divisors (see below), whose sum is σ = 2915900. Its totient is φ = 1345788.

The previous prime is 2018677. The next prime is 2018713. The reversal of 2018691 is 1968102.

It is not a de Polignac number, because 2018691 - 2¹⁴ = 2002307 is a prime.

It is a super-2 number, since 2×2018691² = 8150226706962, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2018651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112141 + ... + 112158.

2^2018691 is an apocalyptic number.

2018691 is a deficient number, since it is larger than the sum of its proper divisors (897209).

2018691 is a wasteful number, since it uses less digits than its factorization.

2018691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224305 (or 224302 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2018691 is about 1420.8064611340. The cubic root of 2018691 is about 126.3833750434.

The spelling of 2018691 in words is "two million, eighteen thousand, six hundred ninety-one".