2023691 has 4 divisors (see below), whose sum is σ = 2042712. Its totient is φ = 2004672.

The previous prime is 2023667. The next prime is 2023727. The reversal of 2023691 is 1963202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1963202 = 2 ⋅981601.

It is a cyclic number.

It is not a de Polignac number, because 2023691 - 2¹⁴ = 2007307 is a prime.

It is a super-3 number, since 3×2023691³ = 24863018633337385113, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2023621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9350 + ... + 9563.

It is an arithmetic number, because the mean of its divisors is an integer number (510678).

2^2023691 is an apocalyptic number.

2023691 is a deficient number, since it is larger than the sum of its proper divisors (19021).

2023691 is a wasteful number, since it uses less digits than its factorization.

2023691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19020.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2023691 is about 1422.5649370064. The cubic root of 2023691 is about 126.4876333425.

Adding to 2023691 its reverse (1963202), we get a palindrome (3986893).

The spelling of 2023691 in words is "two million, twenty-three thousand, six hundred ninety-one".