321071897 has 2 divisors, whose sum is σ = 321071898. Its totient is φ = 321071896.

The previous prime is 321071893. The next prime is 321071939. The reversal of 321071897 is 798170123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252778201 + 68293696 = 15899^2 + 8264^2 .

It is a cyclic number.

It is not a de Polignac number, because 321071897 - 2² = 321071893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321071897.

It is not a weakly prime, because it can be changed into another prime (321071893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160535948 + 160535949.

It is an arithmetic number, because the mean of its divisors is an integer number (160535949).

Almost surely, 2^321071897 is an apocalyptic number.

It is an amenable number.

321071897 is a deficient number, since it is larger than the sum of its proper divisors (1).

321071897 is an equidigital number, since it uses as much as digits as its factorization.

321071897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 321071897 is about 17918.4792044414. The cubic root of 321071897 is about 684.7532433896.

The spelling of 321071897 in words is "three hundred twenty-one million, seventy-one thousand, eight hundred ninety-seven".