91273273091 has 100 divisors (see below), whose sum is σ = 126878644824. Its totient is φ = 65651105520.

The previous prime is 91273273033. The next prime is 91273273097. The reversal of 91273273091 is 19037237219.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 91273273091 - 2²² = 91269078787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91273273097) 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 99 ways as a sum of consecutive naturals, for example, 7021021001 + ... + 7021021013.

Almost surely, 2^91273273091 is an apocalyptic number.

91273273091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91273273091 is a deficient number, since it is larger than the sum of its proper divisors (35605371733).

91273273091 is an frugal number, since it uses more digits than its factorization.

91273273091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 44.

Multiplying 91273273091 by its sum of digits (44), we get a square (4016024016004 = 2004002²).

The spelling of 91273273091 in words is "ninety-one billion, two hundred seventy-three million, two hundred seventy-three thousand, ninety-one".