2191132780 has 24 divisors (see below), whose sum is σ = 4602705408. Its totient is φ = 876200448.

The previous prime is 2191132759. The next prime is 2191132781. The reversal of 2191132780 is 872311912.

It is not an unprimeable number, because it can be changed into a prime (2191132781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65532 + ... + 93148.

It is an arithmetic number, because the mean of its divisors is an integer number (191779392).

Almost surely, 2^2191132780 is an apocalyptic number.

2191132780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191132780 is an abundant number, since it is smaller than the sum of its proper divisors (2411572628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191132780 is a wasteful number, since it uses less digits than its factorization.

2191132780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31593 (or 31591 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 2191132780 is about 46809.5372760723. The cubic root of 2191132780 is about 1298.8417257034.

It can be divided in two parts, 2191132 and 780, that added together give a palindrome (2191912).

The spelling of 2191132780 in words is "two billion, one hundred ninety-one million, one hundred thirty-two thousand, seven hundred eighty".