91918291091 has 8 divisors (see below), whose sum is σ = 101918344368. Its totient is φ = 82192212000.

The previous prime is 91918291061. The next prime is 91918291109. The reversal of 91918291091 is 19019281919.

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 91918291091 - 2¹⁸ = 91918028947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91918291061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68492840 + ... + 68494181.

It is an arithmetic number, because the mean of its divisors is an integer number (12739793046).

Almost surely, 2^91918291091 is an apocalyptic number.

91918291091 is a deficient number, since it is larger than the sum of its proper divisors (10000053277).

91918291091 is a wasteful number, since it uses less digits than its factorization.

91918291091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136987093.

The product of its (nonzero) digits is 104976, while the sum is 50.

The spelling of 91918291091 in words is "ninety-one billion, nine hundred eighteen million, two hundred ninety-one thousand, ninety-one".