91217189252 has 12 divisors (see below), whose sum is σ = 182434378560. Its totient is φ = 39093081096.

The previous prime is 91217189209. The next prime is 91217189257. The reversal of 91217189252 is 25298171219.

91217189252 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 91217189197 and 91217189206.

It is not an unprimeable number, because it can be changed into a prime (91217189257) 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, 1628878352 + ... + 1628878407.

It is an arithmetic number, because the mean of its divisors is an integer number (15202864880).

Almost surely, 2^91217189252 is an apocalyptic number.

It is an amenable number.

91217189252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91217189252 is a wasteful number, since it uses less digits than its factorization.

91217189252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257756770 (or 3257756768 counting only the distinct ones).

The product of its digits is 181440, while the sum is 47.

The spelling of 91217189252 in words is "ninety-one billion, two hundred seventeen million, one hundred eighty-nine thousand, two hundred fifty-two".