91103831091 has 192 divisors, whose sum is σ = 173303603200. Its totient is φ = 45768602880.

The previous prime is 91103831083. The next prime is 91103831131. The reversal of 91103831091 is 19013830119.

It is not a de Polignac number, because 91103831091 - 2³ = 91103831083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91103831051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 83351541 + ... + 83352633.

Almost surely, 2^91103831091 is an apocalyptic number.

91103831091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91103831091 is a deficient number, since it is larger than the sum of its proper divisors (82199772109).

91103831091 is a wasteful number, since it uses less digits than its factorization.

91103831091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 91103831091 in words is "ninety-one billion, one hundred three million, eight hundred thirty-one thousand, ninety-one".