997609 has 2 divisors, whose sum is σ = 997610. Its totient is φ = 997608.

The previous prime is 997597. The next prime is 997627. The reversal of 997609 is 906799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994009 + 3600 = 997^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 997609 - 2⁹ = 997097 is a prime.

It is not a weakly prime, because it can be changed into another prime (997649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498804 + 498805.

It is an arithmetic number, because the mean of its divisors is an integer number (498805).

2⁹⁹⁷⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

997609 is a deficient number, since it is larger than the sum of its proper divisors (1).

997609 is an equidigital number, since it uses as much as digits as its factorization.

997609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 997609 is about 998.8037845343. The cubic root of 997609 is about 99.9202363946.

The spelling of 997609 in words is "nine hundred ninety-seven thousand, six hundred nine".