4090091 has 4 divisors (see below), whose sum is σ = 4200672. Its totient is φ = 3979512.

The previous prime is 4090069. The next prime is 4090103. The reversal of 4090091 is 1900904.

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 4090091 - 2¹⁸ = 3827947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4090001) 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, 55235 + ... + 55308.

It is an arithmetic number, because the mean of its divisors is an integer number (1050168).

Almost surely, 2^4090091 is an apocalyptic number.

4090091 is a deficient number, since it is larger than the sum of its proper divisors (110581).

4090091 is a wasteful number, since it uses less digits than its factorization.

4090091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110580.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 4090091 is about 2022.3973397926. The cubic root of 4090091 is about 159.9230228675.

Adding to 4090091 its reverse (1900904), we get a palindrome (5990995).

The spelling of 4090091 in words is "four million, ninety thousand, ninety-one".