4168991 has 4 divisors (see below), whose sum is σ = 4174800. Its totient is φ = 4163184.

The previous prime is 4168987. The next prime is 4169057. The reversal of 4168991 is 1998614.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998614 = 2 ⋅999307.

It is a cyclic number.

It is not a de Polignac number, because 4168991 - 2² = 4168987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4168951) 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, 1646 + ... + 3323.

It is an arithmetic number, because the mean of its divisors is an integer number (1043700).

Almost surely, 2^4168991 is an apocalyptic number.

4168991 is a deficient number, since it is larger than the sum of its proper divisors (5809).

4168991 is an equidigital number, since it uses as much as digits as its factorization.

4168991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5808.

The product of its digits is 15552, while the sum is 38.

The square root of 4168991 is about 2041.8107160068. The cubic root of 4168991 is about 160.9448134610.

It can be divided in two parts, 41 and 68991, that multiplied together give a triangular number (2828631 = T₂₃₇₈).

The spelling of 4168991 in words is "four million, one hundred sixty-eight thousand, nine hundred ninety-one".