91918481919 has 8 divisors (see below), whose sum is σ = 133699610112. Its totient is φ = 55708170840.

The previous prime is 91918481819. The next prime is 91918481923.

91918481919 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 91918481919 - 2⁷ = 91918481791 is a prime.

It is a super-2 number, since 2×91918481919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91918481969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1392704239 + ... + 1392704304.

It is an arithmetic number, because the mean of its divisors is an integer number (16712451264).

Almost surely, 2^91918481919 is an apocalyptic number.

91918481919 is a deficient number, since it is larger than the sum of its proper divisors (41781128193).

91918481919 is a wasteful number, since it uses less digits than its factorization.

91918481919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785408557.

The product of its digits is 1679616, while the sum is 60.

The spelling of 91918481919 in words is "ninety-one billion, nine hundred eighteen million, four hundred eighty-one thousand, nine hundred nineteen".