316821697 has 2 divisors, whose sum is σ = 316821698. Its totient is φ = 316821696.

The previous prime is 316821683. The next prime is 316821763. The reversal of 316821697 is 796128613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309724801 + 7096896 = 17599^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 316821697 - 2⁷ = 316821569 is a prime.

It is not a weakly prime, because it can be changed into another prime (316821097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158410848 + 158410849.

It is an arithmetic number, because the mean of its divisors is an integer number (158410849).

Almost surely, 2^316821697 is an apocalyptic number.

It is an amenable number.

316821697 is a deficient number, since it is larger than the sum of its proper divisors (1).

316821697 is an equidigital number, since it uses as much as digits as its factorization.

316821697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 316821697 is about 17799.4858633613. The cubic root of 316821697 is about 681.7183308091.

The spelling of 316821697 in words is "three hundred sixteen million, eight hundred twenty-one thousand, six hundred ninety-seven".