91088281 has 2 divisors, whose sum is σ = 91088282. Its totient is φ = 91088280.

The previous prime is 91088279. The next prime is 91088287. The reversal of 91088281 is 18288019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91030681 + 57600 = 9541^2 + 240^2 .

It is an emirp because it is prime and its reverse (18288019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91088281 - 2¹ = 91088279 is a prime.

It is a super-2 number, since 2×91088281² = 16594149871069922, which contains 22 as substring.

Together with 91088279, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91088281.

It is not a weakly prime, because it can be changed into another prime (91088287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45544140 + 45544141.

It is an arithmetic number, because the mean of its divisors is an integer number (45544141).

Almost surely, 2^91088281 is an apocalyptic number.

It is an amenable number.

91088281 is a deficient number, since it is larger than the sum of its proper divisors (1).

91088281 is an equidigital number, since it uses as much as digits as its factorization.

91088281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 91088281 is about 9544.0180741656. The cubic root of 91088281 is about 449.9395490813.

The spelling of 91088281 in words is "ninety-one million, eighty-eight thousand, two hundred eighty-one".