2011997 has 4 divisors (see below), whose sum is σ = 2166780. Its totient is φ = 1857216.

The previous prime is 2011987. The next prime is 2012009. The reversal of 2011997 is 7991102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1069156 + 942841 = 1034^2 + 971^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011997 - 2¹⁰ = 2010973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011907) 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, 77372 + ... + 77397.

It is an arithmetic number, because the mean of its divisors is an integer number (541695).

2^2011997 is an apocalyptic number.

It is an amenable number.

2011997 is a deficient number, since it is larger than the sum of its proper divisors (154783).

2011997 is a wasteful number, since it uses less digits than its factorization.

2011997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154782.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 2011997 is about 1418.4488006269. The cubic root of 2011997 is about 126.2435241589.

The spelling of 2011997 in words is "two million, eleven thousand, nine hundred ninety-seven".