4011691 has 4 divisors (see below), whose sum is σ = 4015872. Its totient is φ = 4007512.

The previous prime is 4011673. The next prime is 4011701. The reversal of 4011691 is 1961104.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4011691 - 2¹⁹ = 3487403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4011671) 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, 150 + ... + 2836.

It is an arithmetic number, because the mean of its divisors is an integer number (1003968).

Almost surely, 2^4011691 is an apocalyptic number.

4011691 is a deficient number, since it is larger than the sum of its proper divisors (4181).

4011691 is a wasteful number, since it uses less digits than its factorization.

4011691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 4011691 is about 2002.9206174984. The cubic root of 4011691 is about 158.8946073182.

Adding to 4011691 its reverse (1961104), we get a palindrome (5972795).

The spelling of 4011691 in words is "four million, eleven thousand, six hundred ninety-one".