997859543 has 2 divisors, whose sum is σ = 997859544. Its totient is φ = 997859542.

The previous prime is 997859477. The next prime is 997859563. The reversal of 997859543 is 345958799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997859543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997859563) 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, 498929771 + 498929772.

It is an arithmetic number, because the mean of its divisors is an integer number (498929772).

Almost surely, 2^997859543 is an apocalyptic number.

997859543 is a deficient number, since it is larger than the sum of its proper divisors (1).

997859543 is an equidigital number, since it uses as much as digits as its factorization.

997859543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12247200, while the sum is 59.

The square root of 997859543 is about 31588.9148753166. The cubic root of 997859543 is about 999.2860046653.

The spelling of 997859543 in words is "nine hundred ninety-seven million, eight hundred fifty-nine thousand, five hundred forty-three".