91143998 has 32 divisors (see below), whose sum is σ = 153474048. Its totient is φ = 40240800.

The previous prime is 91143973. The next prime is 91144033. The reversal of 91143998 is 89934119.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 186911 + ... + 187397.

It is an arithmetic number, because the mean of its divisors is an integer number (4796064).

Almost surely, 2^91143998 is an apocalyptic number.

91143998 is a deficient number, since it is larger than the sum of its proper divisors (62330050).

91143998 is a wasteful number, since it uses less digits than its factorization.

91143998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

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

The square root of 91143998 is about 9546.9365767245. The cubic root of 91143998 is about 450.0312702550.

The spelling of 91143998 in words is "ninety-one million, one hundred forty-three thousand, nine hundred ninety-eight".