1316979729 has 40 divisors (see below), whose sum is σ = 2124052392. Its totient is φ = 808392960.

The previous prime is 1316979709. The next prime is 1316979731. The reversal of 1316979729 is 9279796131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 239630400 + 1077349329 = 15480^2 + 32823^2 .

It is not a de Polignac number, because 1316979729 - 2¹⁷ = 1316848657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1316979709) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 484077 + ... + 486789.

Almost surely, 2^1316979729 is an apocalyptic number.

It is an amenable number.

1316979729 is a deficient number, since it is larger than the sum of its proper divisors (807072663).

1316979729 is a wasteful number, since it uses less digits than its factorization.

1316979729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199 (or 3190 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 1316979729 is about 36290.2153341641. The cubic root of 1316979729 is about 1096.1240249940.

The spelling of 1316979729 in words is "one billion, three hundred sixteen million, nine hundred seventy-nine thousand, seven hundred twenty-nine".