99988961 has 2 divisors, whose sum is σ = 99988962. Its totient is φ = 99988960.

The previous prime is 99988913. The next prime is 99988997. The reversal of 99988961 is 16988999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 45819361 = 7360^2 + 6769^2 .

It is a cyclic number.

It is not a de Polignac number, because 99988961 - 2¹⁴ = 99972577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99988961.

It is not a weakly prime, because it can be changed into another prime (99988261) 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, 49994480 + 49994481.

It is an arithmetic number, because the mean of its divisors is an integer number (49994481).

Almost surely, 2^99988961 is an apocalyptic number.

It is an amenable number.

99988961 is a deficient number, since it is larger than the sum of its proper divisors (1).

99988961 is an equidigital number, since it uses as much as digits as its factorization.

99988961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 59.

The square root of 99988961 is about 9999.4480347667. The cubic root of 99988961 is about 464.1418032331.

The spelling of 99988961 in words is "ninety-nine million, nine hundred eighty-eight thousand, nine hundred sixty-one".