997580609 has 2 divisors, whose sum is σ = 997580610. Its totient is φ = 997580608.

The previous prime is 997580603. The next prime is 997580659. The reversal of 997580609 is 906085799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535459600 + 462121009 = 23140^2 + 21497^2 .

It is a cyclic number.

It is not a de Polignac number, because 997580609 - 2²⁴ = 980803393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (997580603) 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, 498790304 + 498790305.

It is an arithmetic number, because the mean of its divisors is an integer number (498790305).

Almost surely, 2^997580609 is an apocalyptic number.

It is an amenable number.

997580609 is a deficient number, since it is larger than the sum of its proper divisors (1).

997580609 is an equidigital number, since it uses as much as digits as its factorization.

997580609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 997580609 is about 31584.4995052953. The cubic root of 997580609 is about 999.1928850741.

The spelling of 997580609 in words is "nine hundred ninety-seven million, five hundred eighty thousand, six hundred nine".