1321841191 has 16 divisors (see below), whose sum is σ = 1540575360. Its totient is φ = 1121424480.

The previous prime is 1321841179. The next prime is 1321841201. The reversal of 1321841191 is 1911481231.

It is not a de Polignac number, because 1321841191 - 2⁹ = 1321840679 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 (1321841111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33196 + ... + 61201.

It is an arithmetic number, because the mean of its divisors is an integer number (96285960).

Almost surely, 2^1321841191 is an apocalyptic number.

1321841191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321841191 is a deficient number, since it is larger than the sum of its proper divisors (218734169).

1321841191 is a wasteful number, since it uses less digits than its factorization.

1321841191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94494.

The product of its digits is 1728, while the sum is 31.

The square root of 1321841191 is about 36357.1339767039. The cubic root of 1321841191 is about 1097.4711026477.

The spelling of 1321841191 in words is "one billion, three hundred twenty-one million, eight hundred forty-one thousand, one hundred ninety-one".