1316020729 has 3 divisors (see below), whose sum is σ = 1316057007. Its totient is φ = 1315984452.

The previous prime is 1316020697. The next prime is 1316020763. The reversal of 1316020729 is 9270206131.

The square root of 1316020729 is 36277.

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: 9270206131 = 17 ⋅545306243.

It can be written as a sum of positive squares in only one way, i.e., 1083397225 + 232623504 = 32915^2 + 15252^2 .

It is not a de Polignac number, because 1316020729 - 2⁵ = 1316020697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1316020729.

It is not an unprimeable number, because it can be changed into a prime (1317020729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18139 + ... + 54415.

It is an arithmetic number, because the mean of its divisors is an integer number (438685669).

Almost surely, 2^1316020729 is an apocalyptic number.

1316020729 is the 36277-th square number.

1316020729 is the 18139-th centered octagonal number.

It is an amenable number.

1316020729 is a deficient number, since it is larger than the sum of its proper divisors (36278).

1316020729 is an frugal number, since it uses more digits than its factorization.

1316020729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72554 (or 36277 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The cubic root of 1316020729 is about 1095.8579013854.

The spelling of 1316020729 in words is "one billion, three hundred sixteen million, twenty thousand, seven hundred twenty-nine".