1921382193 has 4 divisors (see below), whose sum is σ = 2561842928. Its totient is φ = 1280921460.

The previous prime is 1921382149. The next prime is 1921382207. The reversal of 1921382193 is 3912831291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1921382193 - 2⁸ = 1921381937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921382093) 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 3 ways as a sum of consecutive naturals, for example, 320230363 + ... + 320230368.

It is an arithmetic number, because the mean of its divisors is an integer number (640460732).

Almost surely, 2^1921382193 is an apocalyptic number.

It is an amenable number.

1921382193 is a deficient number, since it is larger than the sum of its proper divisors (640460735).

1921382193 is an equidigital number, since it uses as much as digits as its factorization.

1921382193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640460734.

The product of its digits is 23328, while the sum is 39.

The square root of 1921382193 is about 43833.5738104937. The cubic root of 1921382193 is about 1243.1911804951.

The spelling of 1921382193 in words is "one billion, nine hundred twenty-one million, three hundred eighty-two thousand, one hundred ninety-three".