91228561207 has 16 divisors (see below), whose sum is σ = 106033779712. Its totient is φ = 76877164800.

The previous prime is 91228561187. The next prime is 91228561217. The reversal of 91228561207 is 70216582219.

It is a cyclic number.

It is not a de Polignac number, because 91228561207 - 2¹¹ = 91228559159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91228561217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342363 + ... + 547420.

It is an arithmetic number, because the mean of its divisors is an integer number (6627111232).

Almost surely, 2^91228561207 is an apocalyptic number.

91228561207 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

91228561207 is a deficient number, since it is larger than the sum of its proper divisors (14805218505).

91228561207 is a wasteful number, since it uses less digits than its factorization.

91228561207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890038.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 91228561207 in words is "ninety-one billion, two hundred twenty-eight million, five hundred sixty-one thousand, two hundred seven".