2188198681 has 8 divisors (see below), whose sum is σ = 2206760864. Its totient is φ = 2169711360.

The previous prime is 2188198619. The next prime is 2188198687. The reversal of 2188198681 is 1868918812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188198681 is a prime.

It is a super-2 number, since 2×2188198681² = 9576426935060279522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188198687) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40786 + ... + 77716.

It is an arithmetic number, because the mean of its divisors is an integer number (275845108).

Almost surely, 2^2188198681 is an apocalyptic number.

It is an amenable number.

2188198681 is a deficient number, since it is larger than the sum of its proper divisors (18562183).

2188198681 is a wasteful number, since it uses less digits than its factorization.

2188198681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37431.

The product of its digits is 442368, while the sum is 52.

The square root of 2188198681 is about 46778.1859524287. The cubic root of 2188198681 is about 1298.2617163502.

The spelling of 2188198681 in words is "two billion, one hundred eighty-eight million, one hundred ninety-eight thousand, six hundred eighty-one".