2218997993 has 4 divisors (see below), whose sum is σ = 2239736400. Its totient is φ = 2198259588.

The previous prime is 2218997987. The next prime is 2218998013. The reversal of 2218997993 is 3997998122.

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 2218997993 - 2¹² = 2218993897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218997923) 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 3 ways as a sum of consecutive naturals, for example, 10369043 + ... + 10369256.

It is an arithmetic number, because the mean of its divisors is an integer number (559934100).

Almost surely, 2^2218997993 is an apocalyptic number.

It is an amenable number.

2218997993 is a deficient number, since it is larger than the sum of its proper divisors (20738407).

2218997993 is a wasteful number, since it uses less digits than its factorization.

2218997993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20738406.

The product of its digits is 4408992, while the sum is 59.

The square root of 2218997993 is about 47106.2415503508. The cubic root of 2218997993 is about 1304.3244533788.

The spelling of 2218997993 in words is "two billion, two hundred eighteen million, nine hundred ninety-seven thousand, nine hundred ninety-three".