321679493 has 2 divisors, whose sum is σ = 321679494. Its totient is φ = 321679492.

The previous prime is 321679489. The next prime is 321679543. The reversal of 321679493 is 394976123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320517409 + 1162084 = 17903^2 + 1078^2 .

It is a cyclic number.

It is not a de Polignac number, because 321679493 - 2² = 321679489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321679453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160839746 + 160839747.

It is an arithmetic number, because the mean of its divisors is an integer number (160839747).

Almost surely, 2^321679493 is an apocalyptic number.

It is an amenable number.

321679493 is a deficient number, since it is larger than the sum of its proper divisors (1).

321679493 is an equidigital number, since it uses as much as digits as its factorization.

321679493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 321679493 is about 17935.4256431232. The cubic root of 321679493 is about 685.1849132273.

The spelling of 321679493 in words is "three hundred twenty-one million, six hundred seventy-nine thousand, four hundred ninety-three".