321650473 has 2 divisors, whose sum is σ = 321650474. Its totient is φ = 321650472.

The previous prime is 321650447. The next prime is 321650479. The reversal of 321650473 is 374056123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243734544 + 77915929 = 15612^2 + 8827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321650473 is a prime.

It is a super-2 number, since 2×321650473² = 206918053562247458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321650479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160825236 + 160825237.

It is an arithmetic number, because the mean of its divisors is an integer number (160825237).

Almost surely, 2^321650473 is an apocalyptic number.

It is an amenable number.

321650473 is a deficient number, since it is larger than the sum of its proper divisors (1).

321650473 is an equidigital number, since it uses as much as digits as its factorization.

321650473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 321650473 is about 17934.6166114584. The cubic root of 321650473 is about 685.1643081793.

The spelling of 321650473 in words is "three hundred twenty-one million, six hundred fifty thousand, four hundred seventy-three".