1979079509 has 18 divisors (see below), whose sum is σ = 2253364470. Its totient is φ = 1734810000.

The previous prime is 1979079503. The next prime is 1979079511. The reversal of 1979079509 is 9059709791.

It can be written as a sum of positive squares in only one way, i.e., 1706103025 + 272976484 = 41305^2 + 16522^2 .

It is not a de Polignac number, because 1979079509 - 2¹⁶ = 1979013973 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 (1979079503) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2634884 + ... + 2635634.

It is an arithmetic number, because the mean of its divisors is an integer number (125186915).

Almost surely, 2^1979079509 is an apocalyptic number.

It is an amenable number.

1979079509 is a deficient number, since it is larger than the sum of its proper divisors (274284961).

1979079509 is an frugal number, since it uses more digits than its factorization.

1979079509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 1607445, while the sum is 56.

The square root of 1979079509 is about 44486.8464717381. The cubic root of 1979079509 is about 1255.5126150422.

It can be divided in two parts, 19790 and 79509, that added together give a palindrome (99299).

The spelling of 1979079509 in words is "one billion, nine hundred seventy-nine million, seventy-nine thousand, five hundred nine".