997749443 has 2 divisors, whose sum is σ = 997749444. Its totient is φ = 997749442.

The previous prime is 997749421. The next prime is 997749457. The reversal of 997749443 is 344947799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997749443 - 2¹⁰ = 997748419 is a prime.

It is not a weakly prime, because it can be changed into another prime (997749143) 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, 498874721 + 498874722.

It is an arithmetic number, because the mean of its divisors is an integer number (498874722).

Almost surely, 2^997749443 is an apocalyptic number.

997749443 is a deficient number, since it is larger than the sum of its proper divisors (1).

997749443 is an equidigital number, since it uses as much as digits as its factorization.

997749443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 56.

The square root of 997749443 is about 31587.1721273051. The cubic root of 997749443 is about 999.2492508501.

The spelling of 997749443 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, four hundred forty-three".