91575150181 has 2 divisors, whose sum is σ = 91575150182. Its totient is φ = 91575150180.

The previous prime is 91575150097. The next prime is 91575150221. The reversal of 91575150181 is 18105157519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63206485281 + 28368664900 = 251409^2 + 168430^2 .

It is a cyclic number.

It is not a de Polignac number, because 91575150181 - 2²¹ = 91573053029 is a prime.

It is a super-2 number, since 2×91575150181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91575150281) 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 as a sum of consecutive naturals, namely, 45787575090 + 45787575091.

It is an arithmetic number, because the mean of its divisors is an integer number (45787575091).

Almost surely, 2^91575150181 is an apocalyptic number.

It is an amenable number.

91575150181 is a deficient number, since it is larger than the sum of its proper divisors (1).

91575150181 is an equidigital number, since it uses as much as digits as its factorization.

91575150181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 43.

The spelling of 91575150181 in words is "ninety-one billion, five hundred seventy-five million, one hundred fifty thousand, one hundred eighty-one".