1220132191 has 4 divisors (see below), whose sum is σ = 1220258584. Its totient is φ = 1220005800.

The previous prime is 1220132189. The next prime is 1220132201. The reversal of 1220132191 is 1912310221.

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 1220132191 - 2¹ = 1220132189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220132171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47400 + ... + 68461.

It is an arithmetic number, because the mean of its divisors is an integer number (305064646).

Almost surely, 2^1220132191 is an apocalyptic number.

1220132191 is a deficient number, since it is larger than the sum of its proper divisors (126393).

1220132191 is a wasteful number, since it uses less digits than its factorization.

1220132191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126392.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1220132191 is about 34930.3906505496. The cubic root of 1220132191 is about 1068.5683216550.

The spelling of 1220132191 in words is "one billion, two hundred twenty million, one hundred thirty-two thousand, one hundred ninety-one".