2181158722 has 4 divisors (see below), whose sum is σ = 3271738086. Its totient is φ = 1090579360.

The previous prime is 2181158711. The next prime is 2181158741. The reversal of 2181158722 is 2278511812.

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

It can be written as a sum of positive squares in only one way, i.e., 1478325601 + 702833121 = 38449^2 + 26511^2 .

It is an unprimeable number.

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, 545289679 + ... + 545289682.

Almost surely, 2^2181158722 is an apocalyptic number.

2181158722 is a deficient number, since it is larger than the sum of its proper divisors (1090579364).

2181158722 is a wasteful number, since it uses less digits than its factorization.

2181158722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090579363.

The product of its digits is 17920, while the sum is 37.

The square root of 2181158722 is about 46702.8770205862. The cubic root of 2181158722 is about 1296.8679476711.

The spelling of 2181158722 in words is "two billion, one hundred eighty-one million, one hundred fifty-eight thousand, seven hundred twenty-two".