2091663 has 60 divisors (see below), whose sum is σ = 3972672. Its totient is φ = 1088640.

The previous prime is 2091659. The next prime is 2091667. The reversal of 2091663 is 3661902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2091659) and next prime (2091667).

It is not a de Polignac number, because 2091663 - 2² = 2091659 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 (2091667) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 67458 + ... + 67488.

2^2091663 is an apocalyptic number.

2091663 is a deficient number, since it is larger than the sum of its proper divisors (1881009).

2091663 is a wasteful number, since it uses less digits than its factorization.

2091663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2091663 is about 1446.2582756894. The cubic root of 2091663 is about 127.8882284369. Note that the first 3 decimals are identical.

The spelling of 2091663 in words is "two million, ninety-one thousand, six hundred sixty-three".