321936397 has 2 divisors, whose sum is σ = 321936398. Its totient is φ = 321936396.

The previous prime is 321936367. The next prime is 321936413. The reversal of 321936397 is 793639123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318051556 + 3884841 = 17834^2 + 1971^2 .

It is an emirp because it is prime and its reverse (793639123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321936397 - 2⁷ = 321936269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321936317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160968198 + 160968199.

It is an arithmetic number, because the mean of its divisors is an integer number (160968199).

Almost surely, 2^321936397 is an apocalyptic number.

It is an amenable number.

321936397 is a deficient number, since it is larger than the sum of its proper divisors (1).

321936397 is an equidigital number, since it uses as much as digits as its factorization.

321936397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 43.

The square root of 321936397 is about 17942.5861290952. The cubic root of 321936397 is about 685.3672685523.

The spelling of 321936397 in words is "three hundred twenty-one million, nine hundred thirty-six thousand, three hundred ninety-seven".