321318997 has 2 divisors, whose sum is σ = 321318998. Its totient is φ = 321318996.

The previous prime is 321318973. The next prime is 321319007. The reversal of 321318997 is 799813123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284461956 + 36857041 = 16866^2 + 6071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321318997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321318197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160659498 + 160659499.

It is an arithmetic number, because the mean of its divisors is an integer number (160659499).

Almost surely, 2^321318997 is an apocalyptic number.

It is an amenable number.

321318997 is a deficient number, since it is larger than the sum of its proper divisors (1).

321318997 is an equidigital number, since it uses as much as digits as its factorization.

321318997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 321318997 is about 17925.3729947245. The cubic root of 321318997 is about 684.9288625577.

The spelling of 321318997 in words is "three hundred twenty-one million, three hundred eighteen thousand, nine hundred ninety-seven".