2187436993 has 4 divisors (see below), whose sum is σ = 2499928000. Its totient is φ = 1874945988.

The previous prime is 2187436987. The next prime is 2187437033. The reversal of 2187436993 is 3996347812.

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 2187436993 - 2⁹ = 2187436481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2187436993.

It is not an unprimeable number, because it can be changed into a prime (2187436963) 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, 156245493 + ... + 156245506.

It is an arithmetic number, because the mean of its divisors is an integer number (624982000).

Almost surely, 2^2187436993 is an apocalyptic number.

It is an amenable number.

2187436993 is a deficient number, since it is larger than the sum of its proper divisors (312491007).

2187436993 is an equidigital number, since it uses as much as digits as its factorization.

2187436993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312491006.

The product of its digits is 1959552, while the sum is 52.

The square root of 2187436993 is about 46770.0437566612. The cubic root of 2187436993 is about 1298.1110619726. Note that the first 3 decimals are identical.

The spelling of 2187436993 in words is "two billion, one hundred eighty-seven million, four hundred thirty-six thousand, nine hundred ninety-three".