997785583 has 2 divisors, whose sum is σ = 997785584. Its totient is φ = 997785582.

The previous prime is 997785557. The next prime is 997785619. The reversal of 997785583 is 385587799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997785583 - 2²¹ = 995688431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997785883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498892791 + 498892792.

It is an arithmetic number, because the mean of its divisors is an integer number (498892792).

Almost surely, 2^997785583 is an apocalyptic number.

997785583 is a deficient number, since it is larger than the sum of its proper divisors (1).

997785583 is an equidigital number, since it uses as much as digits as its factorization.

997785583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19051200, while the sum is 61.

The square root of 997785583 is about 31587.7441897961. The cubic root of 997785583 is about 999.2613154795.

The spelling of 997785583 in words is "nine hundred ninety-seven million, seven hundred eighty-five thousand, five hundred eighty-three".