2188941391 has 8 divisors (see below), whose sum is σ = 2694081824. Its totient is φ = 1731909600.

The previous prime is 2188941371. The next prime is 2188941407. The reversal of 2188941391 is 1931498812.

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 2188941391 - 2⁹ = 2188940879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188941331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12027060 + ... + 12027241.

It is an arithmetic number, because the mean of its divisors is an integer number (336760228).

Almost surely, 2^2188941391 is an apocalyptic number.

2188941391 is a deficient number, since it is larger than the sum of its proper divisors (505140433).

2188941391 is a wasteful number, since it uses less digits than its factorization.

2188941391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24054321.

The product of its digits is 124416, while the sum is 46.

The square root of 2188941391 is about 46786.1239151097. The cubic root of 2188941391 is about 1298.4085834051.

The spelling of 2188941391 in words is "two billion, one hundred eighty-eight million, nine hundred forty-one thousand, three hundred ninety-one".