2187222493 has 4 divisors (see below), whose sum is σ = 2196609948. Its totient is φ = 2177835040.

The previous prime is 2187222491. The next prime is 2187222511. The reversal of 2187222493 is 3942227812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 741854169 + 1445368324 = 27237^2 + 38018^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187222493 - 2¹ = 2187222491 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187222491) 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, 4693378 + ... + 4693843.

It is an arithmetic number, because the mean of its divisors is an integer number (549152487).

Almost surely, 2^2187222493 is an apocalyptic number.

It is an amenable number.

2187222493 is a deficient number, since it is larger than the sum of its proper divisors (9387455).

2187222493 is an equidigital number, since it uses as much as digits as its factorization.

2187222493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9387454.

The product of its digits is 96768, while the sum is 40.

The square root of 2187222493 is about 46767.7505659616. The cubic root of 2187222493 is about 1298.0686296762.

The spelling of 2187222493 in words is "two billion, one hundred eighty-seven million, two hundred twenty-two thousand, four hundred ninety-three".