316021729 has 9 divisors (see below), whose sum is σ = 327829593. Its totient is φ = 304626672.

The previous prime is 316021723. The next prime is 316021733. The reversal of 316021729 is 927120613.

The square root of 316021729 is 17777.

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

It can be written as a sum of positive squares in 4 ways, for example, as 132365025 + 183656704 = 11505^2 + 13552^2 .

It is not a de Polignac number, because 316021729 - 2⁹ = 316021217 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 316021729.

It is not an unprimeable number, because it can be changed into a prime (316021723) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 515227 + ... + 515839.

Almost surely, 2^316021729 is an apocalyptic number.

316021729 is the 17777-th square number.

316021729 is the 8889-th centered octagonal number.

It is an amenable number.

316021729 is a deficient number, since it is larger than the sum of its proper divisors (11807864).

316021729 is an frugal number, since it uses more digits than its factorization.

316021729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284 (or 642 counting only the distinct ones).

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

The cubic root of 316021729 is about 681.1440724789.

The spelling of 316021729 in words is "three hundred sixteen million, twenty-one thousand, seven hundred twenty-nine".