99911081 has 2 divisors, whose sum is σ = 99911082. Its totient is φ = 99911080.

The previous prime is 99911069. The next prime is 99911087. The reversal of 99911081 is 18011999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91030681 + 8880400 = 9541^2 + 2980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99911081 is a prime.

It is a super-3 number, since 3×99911081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99911087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49955540 + 49955541.

It is an arithmetic number, because the mean of its divisors is an integer number (49955541).

Almost surely, 2^99911081 is an apocalyptic number.

It is an amenable number.

99911081 is a deficient number, since it is larger than the sum of its proper divisors (1).

99911081 is an equidigital number, since it uses as much as digits as its factorization.

99911081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 99911081 is about 9995.5530612368. The cubic root of 99911081 is about 464.0212674185.

The spelling of 99911081 in words is "ninety-nine million, nine hundred eleven thousand, eighty-one".