99999541 has 2 divisors, whose sum is σ = 99999542. Its totient is φ = 99999540.

The previous prime is 99999539. The next prime is 99999547. The reversal of 99999541 is 14599999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97812100 + 2187441 = 9890^2 + 1479^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999541 - 2¹ = 99999539 is a prime.

Together with 99999539, it forms a pair of twin primes.

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 (99999547) 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, 49999770 + 49999771.

It is an arithmetic number, because the mean of its divisors is an integer number (49999771).

Almost surely, 2^99999541 is an apocalyptic number.

It is an amenable number.

99999541 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999541 is an equidigital number, since it uses as much as digits as its factorization.

99999541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1180980, while the sum is 55.

The square root of 99999541 is about 9999.9770499737. The cubic root of 99999541 is about 464.1581731971.

It can be divided in two parts, 9999 and 9541, that multiplied together give a palindrome (95400459).

The spelling of 99999541 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred forty-one".