321671897 has 2 divisors, whose sum is σ = 321671898. Its totient is φ = 321671896.

The previous prime is 321671887. The next prime is 321671921. The reversal of 321671897 is 798176123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318658201 + 3013696 = 17851^2 + 1736^2 .

It is an emirp because it is prime and its reverse (798176123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321671897 - 2⁸ = 321671641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321671887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160835948 + 160835949.

It is an arithmetic number, because the mean of its divisors is an integer number (160835949).

Almost surely, 2^321671897 is an apocalyptic number.

It is an amenable number.

321671897 is a deficient number, since it is larger than the sum of its proper divisors (1).

321671897 is an equidigital number, since it uses as much as digits as its factorization.

321671897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 321671897 is about 17935.2138821928. The cubic root of 321671897 is about 685.1795199651.

The spelling of 321671897 in words is "three hundred twenty-one million, six hundred seventy-one thousand, eight hundred ninety-seven".