4012091 has 4 divisors (see below), whose sum is σ = 4026552. Its totient is φ = 3997632.

The previous prime is 4012081. The next prime is 4012103. The reversal of 4012091 is 1902104.

It is a happy number.

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 4012091 - 2¹⁸ = 3749947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4012081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6806 + ... + 7371.

It is an arithmetic number, because the mean of its divisors is an integer number (1006638).

Almost surely, 2^4012091 is an apocalyptic number.

4012091 is a deficient number, since it is larger than the sum of its proper divisors (14461).

4012091 is a wasteful number, since it uses less digits than its factorization.

4012091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14460.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 4012091 is about 2003.0204691915. The cubic root of 4012091 is about 158.8998881944.

Adding to 4012091 its reverse (1902104), we get a palindrome (5914195).

The spelling of 4012091 in words is "four million, twelve thousand, ninety-one".