2006991 has 48 divisors (see below), whose sum is σ = 3638880. Its totient is φ = 1088640.

The previous prime is 2006959. The next prime is 2007001. The reversal of 2006991 is 1996002.

It is a happy number.

It is not a de Polignac number, because 2006991 - 2⁵ = 2006959 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006491) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48931 + ... + 48971.

It is an arithmetic number, because the mean of its divisors is an integer number (75810).

2^2006991 is an apocalyptic number.

2006991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2006991 is a deficient number, since it is larger than the sum of its proper divisors (1631889).

2006991 is a wasteful number, since it uses less digits than its factorization.

2006991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 2006991 is about 1416.6830979439. The cubic root of 2006991 is about 126.1387360733.

The spelling of 2006991 in words is "two million, six thousand, nine hundred ninety-one".