2189315081991 has 32 divisors (see below), whose sum is σ = 3040003686400. Its totient is φ = 1399943139840.

The previous prime is 2189315081983. The next prime is 2189315082011. The reversal of 2189315081991 is 1991805139812.

It is not a de Polignac number, because 2189315081991 - 2³ = 2189315081983 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 (2189315081971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11825445 + ... + 12009153.

It is an arithmetic number, because the mean of its divisors is an integer number (95000115200).

Almost surely, 2^{2189315081991} is an apocalyptic number.

2189315081991 is a deficient number, since it is larger than the sum of its proper divisors (850688604409).

2189315081991 is a wasteful number, since it uses less digits than its factorization.

2189315081991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184879.

The product of its (nonzero) digits is 1399680, while the sum is 57.

The spelling of 2189315081991 in words is "two trillion, one hundred eighty-nine billion, three hundred fifteen million, eighty-one thousand, nine hundred ninety-one".