91093943918 has 4 divisors (see below), whose sum is σ = 136640915880. Its totient is φ = 45546971958.

The previous prime is 91093943903. The next prime is 91093943921. The reversal of 91093943918 is 81934939019.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22773485978 + ... + 22773485981.

It is an arithmetic number, because the mean of its divisors is an integer number (34160228970).

Almost surely, 2^91093943918 is an apocalyptic number.

91093943918 is a deficient number, since it is larger than the sum of its proper divisors (45546971962).

91093943918 is a wasteful number, since it uses less digits than its factorization.

91093943918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45546971961.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The spelling of 91093943918 in words is "ninety-one billion, ninety-three million, nine hundred forty-three thousand, nine hundred eighteen".