2188454681 has 8 divisors (see below), whose sum is σ = 2502256320. Its totient is φ = 1874944368.

The previous prime is 2188454677. The next prime is 2188454689. The reversal of 2188454681 is 1864548812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2188454681 - 2² = 2188454677 is a prime.

It is a super-2 number, since 2×2188454681² = 9578667781581623522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188454689) 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, 56486 + ... + 86991.

It is an arithmetic number, because the mean of its divisors is an integer number (312782040).

Almost surely, 2^2188454681 is an apocalyptic number.

It is an amenable number.

2188454681 is a deficient number, since it is larger than the sum of its proper divisors (313801639).

2188454681 is a wasteful number, since it uses less digits than its factorization.

2188454681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145663.

The product of its digits is 491520, while the sum is 47.

The square root of 2188454681 is about 46780.9221905682. The cubic root of 2188454681 is about 1298.3123427767.

The spelling of 2188454681 in words is "two billion, one hundred eighty-eight million, four hundred fifty-four thousand, six hundred eighty-one".