99953989 has 2 divisors, whose sum is σ = 99953990. Its totient is φ = 99953988.

The previous prime is 99953977. The next prime is 99953993. The reversal of 99953989 is 98935999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84033889 + 15920100 = 9167^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 99953989 - 2⁵ = 99953957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99953969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49976994 + 49976995.

It is an arithmetic number, because the mean of its divisors is an integer number (49976995).

Almost surely, 2^99953989 is an apocalyptic number.

It is an amenable number.

99953989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99953989 is an equidigital number, since it uses as much as digits as its factorization.

99953989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7085880, while the sum is 61.

The square root of 99953989 is about 9997.6991853126. The cubic root of 99953989 is about 464.0876843924.

The spelling of 99953989 in words is "ninety-nine million, nine hundred fifty-three thousand, nine hundred eighty-nine".