2187089391 has 8 divisors (see below), whose sum is σ = 2919718144. Its totient is φ = 1456260120.

The previous prime is 2187089381. The next prime is 2187089407. The reversal of 2187089391 is 1939807812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2187089391 - 2²² = 2182895087 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 2187089391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187089341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447031 + ... + 451896.

It is an arithmetic number, because the mean of its divisors is an integer number (364964768).

Almost surely, 2^2187089391 is an apocalyptic number.

2187089391 is a deficient number, since it is larger than the sum of its proper divisors (732628753).

2187089391 is an equidigital number, since it uses as much as digits as its factorization.

2187089391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899741.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 2187089391 is about 46766.3275338143. The cubic root of 2187089391 is about 1298.0422981017.

The spelling of 2187089391 in words is "two billion, one hundred eighty-seven million, eighty-nine thousand, three hundred ninety-one".