316085521721 has 16 divisors (see below), whose sum is σ = 330287109840. Its totient is φ = 302105260800.

The previous prime is 316085521673. The next prime is 316085521783. The reversal of 316085521721 is 127125580613.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4234755625 + 311850766096 = 65075^2 + 558436^2 .

It is a cyclic number.

It is not a de Polignac number, because 316085521721 - 2²² = 316081327417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316085521021) 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 15 ways as a sum of consecutive naturals, for example, 25408715 + ... + 25421151.

It is an arithmetic number, because the mean of its divisors is an integer number (20642944365).

Almost surely, 2^316085521721 is an apocalyptic number.

It is an amenable number.

316085521721 is a deficient number, since it is larger than the sum of its proper divisors (14201588119).

316085521721 is a wasteful number, since it uses less digits than its factorization.

316085521721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21244.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 316085521721 in words is "three hundred sixteen billion, eighty-five million, five hundred twenty-one thousand, seven hundred twenty-one".