3311991 has 12 divisors (see below), whose sum is σ = 5065632. Its totient is φ = 2078016.

The previous prime is 3311983. The next prime is 3311999. The reversal of 3311991 is 1991133.

It is an interprime number because it is at equal distance from previous prime (3311983) and next prime (3311999).

It is not a de Polignac number, because 3311991 - 2³ = 3311983 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3311999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10671 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (422136).

Almost surely, 2^3311991 is an apocalyptic number.

3311991 is a deficient number, since it is larger than the sum of its proper divisors (1753641).

3311991 is a wasteful number, since it uses less digits than its factorization.

3311991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21670 (or 21667 counting only the distinct ones).

The product of its digits is 729, while the sum is 27.

The square root of 3311991 is about 1819.8876338939. The cubic root of 3311991 is about 149.0606632555.

The spelling of 3311991 in words is "three million, three hundred eleven thousand, nine hundred ninety-one".