321673997 has 2 divisors, whose sum is σ = 321673998. Its totient is φ = 321673996.

The previous prime is 321673973. The next prime is 321674029. The reversal of 321673997 is 799376123.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169546441 + 152127556 = 13021^2 + 12334^2 .

It is a cyclic number.

It is not a de Polignac number, because 321673997 - 2²² = 317479693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321679997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160836998 + 160836999.

It is an arithmetic number, because the mean of its divisors is an integer number (160836999).

Almost surely, 2^321673997 is an apocalyptic number.

It is an amenable number.

321673997 is a deficient number, since it is larger than the sum of its proper divisors (1).

321673997 is an equidigital number, since it uses as much as digits as its factorization.

321673997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 47.

The square root of 321673997 is about 17935.2724261440. The cubic root of 321673997 is about 685.1810110019.

The spelling of 321673997 in words is "three hundred twenty-one million, six hundred seventy-three thousand, nine hundred ninety-seven".