997357321 has 2 divisors, whose sum is σ = 997357322. Its totient is φ = 997357320.

The previous prime is 997357307. The next prime is 997357337. The reversal of 997357321 is 123753799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996286096 + 1071225 = 31564^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 997357321 - 2²³ = 988968713 is a prime.

It is not a weakly prime, because it can be changed into another prime (997357301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498678660 + 498678661.

It is an arithmetic number, because the mean of its divisors is an integer number (498678661).

Almost surely, 2^997357321 is an apocalyptic number.

It is an amenable number.

997357321 is a deficient number, since it is larger than the sum of its proper divisors (1).

997357321 is an equidigital number, since it uses as much as digits as its factorization.

997357321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 46.

The square root of 997357321 is about 31580.9645356186. The cubic root of 997357321 is about 999.1183298863.

The spelling of 997357321 in words is "nine hundred ninety-seven million, three hundred fifty-seven thousand, three hundred twenty-one".