997328687 has 2 divisors, whose sum is σ = 997328688. Its totient is φ = 997328686.

The previous prime is 997328653. The next prime is 997328729. The reversal of 997328687 is 786823799.

It is a weak prime.

It is an emirp because it is prime and its reverse (786823799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997328687 - 2²⁰ = 996280111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997328287) 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, 498664343 + 498664344.

It is an arithmetic number, because the mean of its divisors is an integer number (498664344).

Almost surely, 2^997328687 is an apocalyptic number.

997328687 is a deficient number, since it is larger than the sum of its proper divisors (1).

997328687 is an equidigital number, since it uses as much as digits as its factorization.

997328687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 997328687 is about 31580.5111896562. The cubic root of 997328687 is about 999.1087682753.

The spelling of 997328687 in words is "nine hundred ninety-seven million, three hundred twenty-eight thousand, six hundred eighty-seven".