1321019983 has 4 divisors (see below), whose sum is σ = 1321259080. Its totient is φ = 1320780888.

The previous prime is 1321019963. The next prime is 1321020013. The reversal of 1321019983 is 3899101231.

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 1321019983 - 2⁵ = 1321019951 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 (1321019963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111060 + ... + 122377.

It is an arithmetic number, because the mean of its divisors is an integer number (330314770).

Almost surely, 2^1321019983 is an apocalyptic number.

1321019983 is a deficient number, since it is larger than the sum of its proper divisors (239097).

1321019983 is an equidigital number, since it uses as much as digits as its factorization.

1321019983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239096.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1321019983 is about 36345.8385926092. The cubic root of 1321019983 is about 1097.2437836734.

The spelling of 1321019983 in words is "one billion, three hundred twenty-one million, nineteen thousand, nine hundred eighty-three".