91909101010 has 32 divisors (see below), whose sum is σ = 178197967872. Its totient is φ = 34030856640.

The previous prime is 91909100971. The next prime is 91909101017. The reversal of 91909101010 is 1010190919.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (91909101017) 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 15 ways as a sum of consecutive naturals, for example, 6438109 + ... + 6452368.

It is an arithmetic number, because the mean of its divisors is an integer number (5568686496).

Almost surely, 2^91909101010 is an apocalyptic number.

91909101010 is a deficient number, since it is larger than the sum of its proper divisors (86288866862).

91909101010 is a wasteful number, since it uses less digits than its factorization.

91909101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890538.

The product of its (nonzero) digits is 729, while the sum is 31.

Adding to 91909101010 its reverse (1010190919), we get a palindrome (92919291929).

The spelling of 91909101010 in words is "ninety-one billion, nine hundred nine million, one hundred one thousand, ten".