99858961 has 2 divisors, whose sum is σ = 99858962. Its totient is φ = 99858960.

The previous prime is 99858959. The next prime is 99858989. The reversal of 99858961 is 16985899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51208336 + 48650625 = 7156^2 + 6975^2 .

It is a cyclic number.

It is not a de Polignac number, because 99858961 - 2¹ = 99858959 is a prime.

Together with 99858959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99858911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49929480 + 49929481.

It is an arithmetic number, because the mean of its divisors is an integer number (49929481).

Almost surely, 2^99858961 is an apocalyptic number.

It is an amenable number.

99858961 is a deficient number, since it is larger than the sum of its proper divisors (1).

99858961 is an equidigital number, since it uses as much as digits as its factorization.

99858961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 55.

The square root of 99858961 is about 9992.9455617450. The cubic root of 99858961 is about 463.9405656756.

The spelling of 99858961 in words is "ninety-nine million, eight hundred fifty-eight thousand, nine hundred sixty-one".