997859563 has 2 divisors, whose sum is σ = 997859564. Its totient is φ = 997859562.

The previous prime is 997859543. The next prime is 997859573. The reversal of 997859563 is 365958799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997859563 is a prime.

It is not a weakly prime, because it can be changed into another prime (997859543) 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, 498929781 + 498929782.

It is an arithmetic number, because the mean of its divisors is an integer number (498929782).

Almost surely, 2^997859563 is an apocalyptic number.

997859563 is a deficient number, since it is larger than the sum of its proper divisors (1).

997859563 is an equidigital number, since it uses as much as digits as its factorization.

997859563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18370800, while the sum is 61.

The square root of 997859563 is about 31588.9151918834. The cubic root of 997859563 is about 999.2860113415.

The spelling of 997859563 in words is "nine hundred ninety-seven million, eight hundred fifty-nine thousand, five hundred sixty-three".