997837843 has 2 divisors, whose sum is σ = 997837844. Its totient is φ = 997837842.

The previous prime is 997837823. The next prime is 997837849. The reversal of 997837843 is 348738799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997837843 - 2⁵ = 997837811 is a prime.

It is not a weakly prime, because it can be changed into another prime (997837849) 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, 498918921 + 498918922.

It is an arithmetic number, because the mean of its divisors is an integer number (498918922).

Almost surely, 2^997837843 is an apocalyptic number.

997837843 is a deficient number, since it is larger than the sum of its proper divisors (1).

997837843 is an equidigital number, since it uses as much as digits as its factorization.

997837843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 58.

The square root of 997837843 is about 31588.5713985296. The cubic root of 997837843 is about 999.2787609393.

The spelling of 997837843 in words is "nine hundred ninety-seven million, eight hundred thirty-seven thousand, eight hundred forty-three".