91891060 has 12 divisors (see below), whose sum is σ = 192971268. Its totient is φ = 36756416.

The previous prime is 91891057. The next prime is 91891061. The reversal of 91891060 is 6019819.

It can be written as a sum of positive squares in 2 ways, for example, as 55264356 + 36626704 = 7434^2 + 6052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91891061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2297257 + ... + 2297296.

It is an arithmetic number, because the mean of its divisors is an integer number (16080939).

Almost surely, 2^91891060 is an apocalyptic number.

It is an amenable number.

91891060 is an abundant number, since it is smaller than the sum of its proper divisors (101080208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91891060 is a wasteful number, since it uses less digits than its factorization.

91891060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594562 (or 4594560 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 91891060 is about 9585.9824744259. The cubic root of 91891060 is about 451.2574869014.

The spelling of 91891060 in words is "ninety-one million, eight hundred ninety-one thousand, sixty".