99997543 has 2 divisors, whose sum is σ = 99997544. Its totient is φ = 99997542.

The previous prime is 99997531. The next prime is 99997571. The reversal of 99997543 is 34579999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99997543 - 2⁵ = 99997511 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99997523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998771 + 49998772.

It is an arithmetic number, because the mean of its divisors is an integer number (49998772).

Almost surely, 2^99997543 is an apocalyptic number.

99997543 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997543 is an equidigital number, since it uses as much as digits as its factorization.

99997543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 55.

The square root of 99997543 is about 9999.8771492454. The cubic root of 99997543 is about 464.1550818689.

It can be divided in two parts, 9999 and 7543, that multiplied together give a palindrome (75422457).

The spelling of 99997543 in words is "ninety-nine million, nine hundred ninety-seven thousand, five hundred forty-three".