321673903 has 2 divisors, whose sum is σ = 321673904. Its totient is φ = 321673902.

The previous prime is 321673879. The next prime is 321673909. The reversal of 321673903 is 309376123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321673903 - 2⁵ = 321673871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321673909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160836951 + 160836952.

It is an arithmetic number, because the mean of its divisors is an integer number (160836952).

Almost surely, 2^321673903 is an apocalyptic number.

321673903 is a deficient number, since it is larger than the sum of its proper divisors (1).

321673903 is an equidigital number, since it uses as much as digits as its factorization.

321673903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 321673903 is about 17935.2698056093. The cubic root of 321673903 is about 685.1809442603.

The spelling of 321673903 in words is "three hundred twenty-one million, six hundred seventy-three thousand, nine hundred three".