91188870973 has 8 divisors (see below), whose sum is σ = 95010174720. Its totient is φ = 87422550240.

The previous prime is 91188870943. The next prime is 91188870979. The reversal of 91188870973 is 37907888119.

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

It is a cyclic number.

It is not a de Polignac number, because 91188870973 - 2¹³ = 91188862781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91188870979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13742368 + ... + 13749001.

It is an arithmetic number, because the mean of its divisors is an integer number (11876271840).

Almost surely, 2^91188870973 is an apocalyptic number.

It is an amenable number.

91188870973 is a deficient number, since it is larger than the sum of its proper divisors (3821303747).

91188870973 is a wasteful number, since it uses less digits than its factorization.

91188870973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27491507.

The product of its (nonzero) digits is 6096384, while the sum is 61.

The spelling of 91188870973 in words is "ninety-one billion, one hundred eighty-eight million, eight hundred seventy thousand, nine hundred seventy-three".