997000591 has 2 divisors, whose sum is σ = 997000592. Its totient is φ = 997000590.

The previous prime is 997000583. The next prime is 997000637. The reversal of 997000591 is 195000799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997000591 - 2³ = 997000583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997000561) 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, 498500295 + 498500296.

It is an arithmetic number, because the mean of its divisors is an integer number (498500296).

Almost surely, 2^997000591 is an apocalyptic number.

997000591 is a deficient number, since it is larger than the sum of its proper divisors (1).

997000591 is an equidigital number, since it uses as much as digits as its factorization.

997000591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 997000591 is about 31575.3161662714. The cubic root of 997000591 is about 998.9991957249. Note that the first 3 decimals are identical.

The spelling of 997000591 in words is "nine hundred ninety-seven million, five hundred ninety-one", and thus it is an aban number.