2181271958 has 4 divisors (see below), whose sum is σ = 3271907940. Its totient is φ = 1090635978.

The previous prime is 2181271957. The next prime is 2181271969. The reversal of 2181271958 is 8591721812.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181271957) 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 as a sum of consecutive naturals, namely, 545317988 + ... + 545317991.

It is an arithmetic number, because the mean of its divisors is an integer number (817976985).

Almost surely, 2^2181271958 is an apocalyptic number.

2181271958 is a deficient number, since it is larger than the sum of its proper divisors (1090635982).

2181271958 is a wasteful number, since it uses less digits than its factorization.

2181271958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090635981.

The product of its digits is 80640, while the sum is 44.

The square root of 2181271958 is about 46704.0893070403. The cubic root of 2181271958 is about 1296.8903898095.

The spelling of 2181271958 in words is "two billion, one hundred eighty-one million, two hundred seventy-one thousand, nine hundred fifty-eight".