321603397 has 2 divisors, whose sum is σ = 321603398. Its totient is φ = 321603396.

The previous prime is 321603379. The next prime is 321603409. The reversal of 321603397 is 793306123.

Together with previous prime (321603379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174927076 + 146676321 = 13226^2 + 12111^2 .

It is an emirp because it is prime and its reverse (793306123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321603397 - 2¹⁵ = 321570629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321603197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160801698 + 160801699.

It is an arithmetic number, because the mean of its divisors is an integer number (160801699).

Almost surely, 2^321603397 is an apocalyptic number.

It is an amenable number.

321603397 is a deficient number, since it is larger than the sum of its proper divisors (1).

321603397 is an equidigital number, since it uses as much as digits as its factorization.

321603397 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 321603397 is about 17933.3041294682. The cubic root of 321603397 is about 685.1308802077.

The spelling of 321603397 in words is "three hundred twenty-one million, six hundred three thousand, three hundred ninety-seven".