1321791983 has 2 divisors, whose sum is σ = 1321791984. Its totient is φ = 1321791982.

The previous prime is 1321791979. The next prime is 1321792039. The reversal of 1321791983 is 3891971231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321791983 - 2² = 1321791979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321791283) 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 as a sum of consecutive naturals, namely, 660895991 + 660895992.

It is an arithmetic number, because the mean of its divisors is an integer number (660895992).

Almost surely, 2^1321791983 is an apocalyptic number.

1321791983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321791983 is an equidigital number, since it uses as much as digits as its factorization.

1321791983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 1321791983 is about 36356.4572393956. The cubic root of 1321791983 is about 1097.4574840102.

The spelling of 1321791983 in words is "one billion, three hundred twenty-one million, seven hundred ninety-one thousand, nine hundred eighty-three".