2199489991 has 4 divisors (see below), whose sum is σ = 2215313800. Its totient is φ = 2183666184.

The previous prime is 2199489911. The next prime is 2199489997. The reversal of 2199489991 is 1999849912.

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

It is a cyclic number.

It is not a de Polignac number, because 2199489991 - 2¹¹ = 2199487943 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 (2199489997) 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, 7911696 + ... + 7911973.

It is an arithmetic number, because the mean of its divisors is an integer number (553828450).

Almost surely, 2^2199489991 is an apocalyptic number.

2199489991 is a deficient number, since it is larger than the sum of its proper divisors (15823809).

2199489991 is a wasteful number, since it uses less digits than its factorization.

2199489991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15823808.

The product of its digits is 3779136, while the sum is 61.

The square root of 2199489991 is about 46898.7205689025. The cubic root of 2199489991 is about 1300.4909370625.

The spelling of 2199489991 in words is "two billion, one hundred ninety-nine million, four hundred eighty-nine thousand, nine hundred ninety-one".