91110020091 has 32 divisors (see below), whose sum is σ = 125024944128. Its totient is φ = 58999933440.

The previous prime is 91110020081. The next prime is 91110020101. The reversal of 91110020091 is 19002001119.

It is an interprime number because it is at equal distance from previous prime (91110020081) and next prime (91110020101).

It is not a de Polignac number, because 91110020091 - 2⁵ = 91110020059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91110020021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3798426 + ... + 3822336.

It is an arithmetic number, because the mean of its divisors is an integer number (3907029504).

Almost surely, 2^91110020091 is an apocalyptic number.

91110020091 is a deficient number, since it is larger than the sum of its proper divisors (33914924037).

91110020091 is a wasteful number, since it uses less digits than its factorization.

91110020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24251.

The product of its (nonzero) digits is 162, while the sum is 24.

The spelling of 91110020091 in words is "ninety-one billion, one hundred ten million, twenty thousand, ninety-one".