2187880791 has 4 divisors (see below), whose sum is σ = 2917174392. Its totient is φ = 1458587192.

The previous prime is 2187880789. The next prime is 2187880817. The reversal of 2187880791 is 1970887812.

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

It is a cyclic number.

It is not a de Polignac number, because 2187880791 - 2¹ = 2187880789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187880741) 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, 364646796 + ... + 364646801.

It is an arithmetic number, because the mean of its divisors is an integer number (729293598).

Almost surely, 2^2187880791 is an apocalyptic number.

2187880791 is a deficient number, since it is larger than the sum of its proper divisors (729293601).

2187880791 is an equidigital number, since it uses as much as digits as its factorization.

2187880791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729293600.

The product of its (nonzero) digits is 451584, while the sum is 51.

The square root of 2187880791 is about 46774.7879845542. The cubic root of 2187880791 is about 1298.1988450933.

The spelling of 2187880791 in words is "two billion, one hundred eighty-seven million, eight hundred eighty thousand, seven hundred ninety-one".