316546721 has 2 divisors, whose sum is σ = 316546722. Its totient is φ = 316546720.

The previous prime is 316546709. The next prime is 316546753. The reversal of 316546721 is 127645613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306075025 + 10471696 = 17495^2 + 3236^2 .

It is an emirp because it is prime and its reverse (127645613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316546721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (316546121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158273360 + 158273361.

It is an arithmetic number, because the mean of its divisors is an integer number (158273361).

Almost surely, 2^316546721 is an apocalyptic number.

It is an amenable number.

316546721 is a deficient number, since it is larger than the sum of its proper divisors (1).

316546721 is an equidigital number, since it uses as much as digits as its factorization.

316546721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 316546721 is about 17791.7599185690. The cubic root of 316546721 is about 681.5210479841.

The spelling of 316546721 in words is "three hundred sixteen million, five hundred forty-six thousand, seven hundred twenty-one".