2181350091 has 4 divisors (see below), whose sum is σ = 2908466792. Its totient is φ = 1454233392.

The previous prime is 2181350089. The next prime is 2181350099. The reversal of 2181350091 is 1900531812.

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

It is not a de Polignac number, because 2181350091 - 2¹ = 2181350089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181350099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363558346 + ... + 363558351.

It is an arithmetic number, because the mean of its divisors is an integer number (727116698).

Almost surely, 2^2181350091 is an apocalyptic number.

2181350091 is a deficient number, since it is larger than the sum of its proper divisors (727116701).

2181350091 is an equidigital number, since it uses as much as digits as its factorization.

2181350091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727116700.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 2181350091 is about 46704.9257680601. The cubic root of 2181350091 is about 1296.9058744639.

The spelling of 2181350091 in words is "two billion, one hundred eighty-one million, three hundred fifty thousand, ninety-one".