321986849 has 2 divisors, whose sum is σ = 321986850. Its totient is φ = 321986848.

The previous prime is 321986837. The next prime is 321986869. The reversal of 321986849 is 948689123.

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., 321664225 + 322624 = 17935^2 + 568^2 .

It is an emirp because it is prime and its reverse (948689123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321986849 - 2⁸ = 321986593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321986797 and 321986806.

It is not a weakly prime, because it can be changed into another prime (321986809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160993424 + 160993425.

It is an arithmetic number, because the mean of its divisors is an integer number (160993425).

Almost surely, 2^321986849 is an apocalyptic number.

It is an amenable number.

321986849 is a deficient number, since it is larger than the sum of its proper divisors (1).

321986849 is an equidigital number, since it uses as much as digits as its factorization.

321986849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 321986849 is about 17943.9920028961. The cubic root of 321986849 is about 685.4030689398.

The spelling of 321986849 in words is "three hundred twenty-one million, nine hundred eighty-six thousand, eight hundred forty-nine".