99755989 has 2 divisors, whose sum is σ = 99755990. Its totient is φ = 99755988.

The previous prime is 99755987. The next prime is 99756029. The reversal of 99755989 is 98955799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 29615364 = 8375^2 + 5442^2 .

It is a cyclic number.

It is not a de Polignac number, because 99755989 - 2¹ = 99755987 is a prime.

Together with 99755987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99755987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49877994 + 49877995.

It is an arithmetic number, because the mean of its divisors is an integer number (49877995).

Almost surely, 2^99755989 is an apocalyptic number.

It is an amenable number.

99755989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99755989 is an equidigital number, since it uses as much as digits as its factorization.

99755989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9185400, while the sum is 61.

The square root of 99755989 is about 9987.7919982346. The cubic root of 99755989 is about 463.7810429594.

The spelling of 99755989 in words is "ninety-nine million, seven hundred fifty-five thousand, nine hundred eighty-nine".