99915943 has 2 divisors, whose sum is σ = 99915944. Its totient is φ = 99915942.

The previous prime is 99915941. The next prime is 99916043. The reversal of 99915943 is 34951999.

It is a weak prime.

It is an emirp because it is prime and its reverse (34951999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99915943 - 2¹ = 99915941 is a prime.

Together with 99915941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99915941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49957971 + 49957972.

It is an arithmetic number, because the mean of its divisors is an integer number (49957972).

Almost surely, 2^99915943 is an apocalyptic number.

99915943 is a deficient number, since it is larger than the sum of its proper divisors (1).

99915943 is an equidigital number, since it uses as much as digits as its factorization.

99915943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 49.

The square root of 99915943 is about 9995.7962664312. The cubic root of 99915943 is about 464.0287942273.

The spelling of 99915943 in words is "ninety-nine million, nine hundred fifteen thousand, nine hundred forty-three".