91168742281 has 16 divisors (see below), whose sum is σ = 97172190864. Its totient is φ = 85238360064.

The previous prime is 91168742267. The next prime is 91168742309. The reversal of 91168742281 is 18224786119.

It can be written as a sum of positive squares in 8 ways, for example, as 3898129225 + 87270613056 = 62435^2 + 295416^2 .

It is a cyclic number.

It is not a de Polignac number, because 91168742281 - 2²³ = 91160353673 is a prime.

It is a super-2 number, since 2×91168742281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91168742381) 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 15 ways as a sum of consecutive naturals, for example, 1529815 + ... + 1588291.

It is an arithmetic number, because the mean of its divisors is an integer number (6073261929).

Almost surely, 2^91168742281 is an apocalyptic number.

It is an amenable number.

91168742281 is a deficient number, since it is larger than the sum of its proper divisors (6003448583).

91168742281 is a wasteful number, since it uses less digits than its factorization.

91168742281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59100.

The product of its digits is 387072, while the sum is 49.

The spelling of 91168742281 in words is "ninety-one billion, one hundred sixty-eight million, seven hundred forty-two thousand, two hundred eighty-one".