99871633 has 2 divisors, whose sum is σ = 99871634. Its totient is φ = 99871632.

The previous prime is 99871631. The next prime is 99871643. The reversal of 99871633 is 33617899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98565184 + 1306449 = 9928^2 + 1143^2 .

It is a cyclic number.

It is not a de Polignac number, because 99871633 - 2¹ = 99871631 is a prime.

Together with 99871631, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99871631) 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, 49935816 + 49935817.

It is an arithmetic number, because the mean of its divisors is an integer number (49935817).

Almost surely, 2^99871633 is an apocalyptic number.

It is an amenable number.

99871633 is a deficient number, since it is larger than the sum of its proper divisors (1).

99871633 is an equidigital number, since it uses as much as digits as its factorization.

99871633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 99871633 is about 9993.5795889161. The cubic root of 99871633 is about 463.9601893732.

The spelling of 99871633 in words is "ninety-nine million, eight hundred seventy-one thousand, six hundred thirty-three".