2228815681 has 4 divisors (see below), whose sum is σ = 2228974000. Its totient is φ = 2228657364.

The previous prime is 2228815627. The next prime is 2228815709. The reversal of 2228815681 is 1865188222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2228815681 - 2⁷ = 2228815553 is a prime.

It is a super-3 number, since 3×2228815681³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2228815081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55731 + ... + 86968.

It is an arithmetic number, because the mean of its divisors is an integer number (557243500).

Almost surely, 2^2228815681 is an apocalyptic number.

It is an amenable number.

2228815681 is a deficient number, since it is larger than the sum of its proper divisors (158319).

2228815681 is a wasteful number, since it uses less digits than its factorization.

2228815681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158318.

The product of its digits is 122880, while the sum is 43.

The square root of 2228815681 is about 47210.3344724436. The cubic root of 2228815681 is about 1306.2452319568.

The spelling of 2228815681 in words is "two billion, two hundred twenty-eight million, eight hundred fifteen thousand, six hundred eighty-one".