91919181852 has 36 divisors (see below), whose sum is σ = 232360464336. Its totient is φ = 30638514240.

The previous prime is 91919181847. The next prime is 91919181853. The reversal of 91919181852 is 25818191919.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×91919181852² (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 (91919181853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1751352 + ... + 1803072.

Almost surely, 2^91919181852 is an apocalyptic number.

It is an amenable number.

91919181852 is an abundant number, since it is smaller than the sum of its proper divisors (140441282484).

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

91919181852 is a wasteful number, since it uses less digits than its factorization.

91919181852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101098 (or 101093 counting only the distinct ones).

The product of its digits is 466560, while the sum is 54.

The spelling of 91919181852 in words is "ninety-one billion, nine hundred nineteen million, one hundred eighty-one thousand, eight hundred fifty-two".