2011197889 has 4 divisors (see below), whose sum is σ = 2011291524. Its totient is φ = 2011104256.

The previous prime is 2011197883. The next prime is 2011197917. The reversal of 2011197889 is 9887911102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1546062400 + 465135489 = 39320^2 + 21567^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011197889 - 2⁵ = 2011197857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011197883) 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, 3249 + ... + 63505.

It is an arithmetic number, because the mean of its divisors is an integer number (502822881).

Almost surely, 2^2011197889 is an apocalyptic number.

It is an amenable number.

2011197889 is a deficient number, since it is larger than the sum of its proper divisors (93635).

2011197889 is an equidigital number, since it uses as much as digits as its factorization.

2011197889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93634.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 2011197889 is about 44846.3810022615. The cubic root of 2011197889 is about 1262.2680843687.

The spelling of 2011197889 in words is "two billion, eleven million, one hundred ninety-seven thousand, eight hundred eighty-nine".