2033991 has 10 divisors (see below), whose sum is σ = 3038552. Its totient is φ = 1355940.

The previous prime is 2033989. The next prime is 2034017. The reversal of 2033991 is 1993302.

It is not a de Polignac number, because 2033991 - 2¹ = 2033989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2033951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12475 + ... + 12636.

2^2033991 is an apocalyptic number.

2033991 is a deficient number, since it is larger than the sum of its proper divisors (1004561).

2033991 is an equidigital number, since it uses as much as digits as its factorization.

2033991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25123 (or 25114 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 2033991 is about 1426.1805636034. The cubic root of 2033991 is about 126.7018654103.

The spelling of 2033991 in words is "two million, thirty-three thousand, nine hundred ninety-one".