91328456181 has 16 divisors (see below), whose sum is σ = 123827486400. Its totient is φ = 59865176448.

The previous prime is 91328456147. The next prime is 91328456203. The reversal of 91328456181 is 18165482319.

It is a happy number.

It is not a de Polignac number, because 91328456181 - 2⁷ = 91328456053 is a prime.

It is a super-2 number, since 2×91328456181² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91328456181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91328456881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907666 + ... + 1003251.

It is an arithmetic number, because the mean of its divisors is an integer number (7739217900).

Almost surely, 2^91328456181 is an apocalyptic number.

It is an amenable number.

91328456181 is a deficient number, since it is larger than the sum of its proper divisors (32499030219).

91328456181 is a wasteful number, since it uses less digits than its factorization.

91328456181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911188.

The product of its digits is 414720, while the sum is 48.

The spelling of 91328456181 in words is "ninety-one billion, three hundred twenty-eight million, four hundred fifty-six thousand, one hundred eighty-one".