997181329 has 2 divisors, whose sum is σ = 997181330. Its totient is φ = 997181328.

The previous prime is 997181299. The next prime is 997181333. The reversal of 997181329 is 923181799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996980625 + 200704 = 31575^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 997181329 - 2⁷ = 997181201 is a prime.

It is not a weakly prime, because it can be changed into another prime (997181369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498590664 + 498590665.

It is an arithmetic number, because the mean of its divisors is an integer number (498590665).

Almost surely, 2^997181329 is an apocalyptic number.

It is an amenable number.

997181329 is a deficient number, since it is larger than the sum of its proper divisors (1).

997181329 is an equidigital number, since it uses as much as digits as its factorization.

997181329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 49.

The square root of 997181329 is about 31578.1780506729. The cubic root of 997181329 is about 999.0595588477.

The spelling of 997181329 in words is "nine hundred ninety-seven million, one hundred eighty-one thousand, three hundred twenty-nine".