91143899 has 8 divisors (see below), whose sum is σ = 113634048. Its totient is φ = 71021160.

The previous prime is 91143889. The next prime is 91143971. The reversal of 91143899 is 99834119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91143899 - 2¹² = 91139803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91143809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591767 + ... + 591920.

It is an arithmetic number, because the mean of its divisors is an integer number (14204256).

Almost surely, 2^91143899 is an apocalyptic number.

91143899 is a deficient number, since it is larger than the sum of its proper divisors (22490149).

91143899 is a wasteful number, since it uses less digits than its factorization.

91143899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183705.

The product of its digits is 69984, while the sum is 44.

The square root of 91143899 is about 9546.9313918138. The cubic root of 91143899 is about 450.0311073146.

The spelling of 91143899 in words is "ninety-one million, one hundred forty-three thousand, eight hundred ninety-nine".