1979983009 has 3 divisors (see below), whose sum is σ = 1980027507. Its totient is φ = 1979938512.

The previous prime is 1979982971. The next prime is 1979983039. The reversal of 1979983009 is 9003899791.

The square root of 1979983009 is 44497.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9003899791 = 37 ⋅243348643.

It can be written as a sum of positive squares in only one way, i.e., 1318053025 + 661929984 = 36305^2 + 25728^2 .

It is not a de Polignac number, because 1979983009 - 2¹³ = 1979974817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979983039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22249 + ... + 66745.

It is an arithmetic number, because the mean of its divisors is an integer number (660009169).

Almost surely, 2^1979983009 is an apocalyptic number.

1979983009 is the 44497-th square number.

1979983009 is the 22249-th centered octagonal number.

It is an amenable number.

1979983009 is a deficient number, since it is larger than the sum of its proper divisors (44498).

1979983009 is an frugal number, since it uses more digits than its factorization.

1979983009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88994 (or 44497 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 55.

The cubic root of 1979983009 is about 1255.7036437613.

The spelling of 1979983009 in words is "one billion, nine hundred seventy-nine million, nine hundred eighty-three thousand, nine".