99609871 has 2 divisors, whose sum is σ = 99609872. Its totient is φ = 99609870.

The previous prime is 99609847. The next prime is 99609899. The reversal of 99609871 is 17890699.

It is a weak prime.

It is an emirp because it is prime and its reverse (17890699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99609871 - 2⁹ = 99609359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99609841) 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, 49804935 + 49804936.

It is an arithmetic number, because the mean of its divisors is an integer number (49804936).

Almost surely, 2^99609871 is an apocalyptic number.

99609871 is a deficient number, since it is larger than the sum of its proper divisors (1).

99609871 is an equidigital number, since it uses as much as digits as its factorization.

99609871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 99609871 is about 9980.4744877185. The cubic root of 99609871 is about 463.5544905713.

The spelling of 99609871 in words is "ninety-nine million, six hundred nine thousand, eight hundred seventy-one".