99888881 has 2 divisors, whose sum is σ = 99888882. Its totient is φ = 99888880.

The previous prime is 99888869. The next prime is 99888911. The reversal of 99888881 is 18888899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 26615281 = 8560^2 + 5159^2 .

It is a cyclic number.

It is not a de Polignac number, because 99888881 - 2¹⁴ = 99872497 is a prime.

It is a super-2 number, since 2×99888881² = 19955577094864322, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99888881.

It is not a weakly prime, because it can be changed into another prime (99818881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49944440 + 49944441.

It is an arithmetic number, because the mean of its divisors is an integer number (49944441).

Almost surely, 2^99888881 is an apocalyptic number.

It is an amenable number.

99888881 is a deficient number, since it is larger than the sum of its proper divisors (1).

99888881 is an equidigital number, since it uses as much as digits as its factorization.

99888881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 59.

The square root of 99888881 is about 9994.4425057129. The cubic root of 99888881 is about 463.9868967391.

The spelling of 99888881 in words is "ninety-nine million, eight hundred eighty-eight thousand, eight hundred eighty-one".