91205853133 has 2 divisors, whose sum is σ = 91205853134. Its totient is φ = 91205853132.

The previous prime is 91205853113. The next prime is 91205853173. The reversal of 91205853133 is 33135850219.

It is an a-pointer prime, because the next prime (91205853173) can be obtained adding 91205853133 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83644159369 + 7561693764 = 289213^2 + 86958^2 .

It is an emirp because it is prime and its reverse (33135850219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91205853133 - 2¹³ = 91205844941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91205853113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45602926566 + 45602926567.

It is an arithmetic number, because the mean of its divisors is an integer number (45602926567).

Almost surely, 2^91205853133 is an apocalyptic number.

It is an amenable number.

91205853133 is a deficient number, since it is larger than the sum of its proper divisors (1).

91205853133 is an equidigital number, since it uses as much as digits as its factorization.

91205853133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 91205853133 in words is "ninety-one billion, two hundred five million, eight hundred fifty-three thousand, one hundred thirty-three".