2181511064 has 16 divisors (see below), whose sum is σ = 4093278000. Its totient is φ = 1089970272.

The previous prime is 2181511039. The next prime is 2181511099. The reversal of 2181511064 is 4601151812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86267 + ... + 108650.

It is an arithmetic number, because the mean of its divisors is an integer number (255829875).

Almost surely, 2^2181511064 is an apocalyptic number.

It is an amenable number.

2181511064 is a deficient number, since it is larger than the sum of its proper divisors (1911766936).

2181511064 is a wasteful number, since it uses less digits than its factorization.

2181511064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196322 (or 196318 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 2181511064 is about 46706.6490341579. The cubic root of 2181511064 is about 1296.9377754557.

Adding to 2181511064 its reverse (4601151812), we get a palindrome (6782662876).

The spelling of 2181511064 in words is "two billion, one hundred eighty-one million, five hundred eleven thousand, sixty-four".