321399997 has 2 divisors, whose sum is σ = 321399998. Its totient is φ = 321399996.

The previous prime is 321399989. The next prime is 321400021. The reversal of 321399997 is 799993123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320911396 + 488601 = 17914^2 + 699^2 .

It is a cyclic number.

It is not a de Polignac number, because 321399997 - 2³ = 321399989 is a prime.

It is a super-3 number, since 3×321399997³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321399917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160699998 + 160699999.

It is an arithmetic number, because the mean of its divisors is an integer number (160699999).

Almost surely, 2^321399997 is an apocalyptic number.

It is an amenable number.

321399997 is a deficient number, since it is larger than the sum of its proper divisors (1).

321399997 is an equidigital number, since it uses as much as digits as its factorization.

321399997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 52.

The square root of 321399997 is about 17927.6322195654. The cubic root of 321399997 is about 684.9864113666.

The spelling of 321399997 in words is "three hundred twenty-one million, three hundred ninety-nine thousand, nine hundred ninety-seven".