1321977983 has 4 divisors (see below), whose sum is σ = 1335606720. Its totient is φ = 1308349248.

The previous prime is 1321977967. The next prime is 1321978037. The reversal of 1321977983 is 3897791231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3897791231 = 31 ⋅125735201.

It is a cyclic number.

It is not a de Polignac number, because 1321977983 - 2⁴ = 1321977967 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 (1321977913) 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, 6814223 + ... + 6814416.

It is an arithmetic number, because the mean of its divisors is an integer number (333901680).

Almost surely, 2^1321977983 is an apocalyptic number.

1321977983 is a deficient number, since it is larger than the sum of its proper divisors (13628737).

1321977983 is an equidigital number, since it uses as much as digits as its factorization.

1321977983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13628736.

The product of its digits is 571536, while the sum is 50.

The square root of 1321977983 is about 36359.0151544290. The cubic root of 1321977983 is about 1097.5089589575.

The spelling of 1321977983 in words is "one billion, three hundred twenty-one million, nine hundred seventy-seven thousand, nine hundred eighty-three".