91228561250 has 30 divisors (see below), whose sum is σ = 171018833799. Its totient is φ = 36487153000.

The previous prime is 91228561217. The next prime is 91228561309. The reversal of 91228561250 is 5216582219.

It can be written as a sum of positive squares in 3 ways, for example, as 21092043361 + 70136517889 = 145231^2 + 264833^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213575.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91228561198 and 91228561207.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 10674479 + ... + 10683021.

Almost surely, 2^91228561250 is an apocalyptic number.

91228561250 is a deficient number, since it is larger than the sum of its proper divisors (79790272549).

91228561250 is an frugal number, since it uses more digits than its factorization.

91228561250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17108 (or 8550 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 91228561250 in words is "ninety-one billion, two hundred twenty-eight million, five hundred sixty-one thousand, two hundred fifty".