99391111 has 2 divisors, whose sum is σ = 99391112. Its totient is φ = 99391110.

The previous prime is 99391087. The next prime is 99391133. The reversal of 99391111 is 11119399.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99391111 - 2⁵ = 99391079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99391151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49695555 + 49695556.

It is an arithmetic number, because the mean of its divisors is an integer number (49695556).

Almost surely, 2^99391111 is an apocalyptic number.

99391111 is the 4459-th centered decagonal number.

99391111 is a deficient number, since it is larger than the sum of its proper divisors (1).

99391111 is an equidigital number, since it uses as much as digits as its factorization.

99391111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 34.

The square root of 99391111 is about 9969.5090651446. The cubic root of 99391111 is about 463.2148940174.

The spelling of 99391111 in words is "ninety-nine million, three hundred ninety-one thousand, one hundred eleven".