91084497481 has 2 divisors, whose sum is σ = 91084497482. Its totient is φ = 91084497480.

The previous prime is 91084497479. The next prime is 91084497509. The reversal of 91084497481 is 18479448019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90155467081 + 929030400 = 300259^2 + 30480^2 .

It is a cyclic number.

It is not a de Polignac number, because 91084497481 - 2¹ = 91084497479 is a prime.

It is a super-2 number, since 2×91084497481² (a number of 23 digits) contains 22 as substring.

Together with 91084497479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91084492481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45542248740 + 45542248741.

It is an arithmetic number, because the mean of its divisors is an integer number (45542248741).

Almost surely, 2^91084497481 is an apocalyptic number.

It is an amenable number.

91084497481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91084497481 is an equidigital number, since it uses as much as digits as its factorization.

91084497481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 91084497481 in words is "ninety-one billion, eighty-four million, four hundred ninety-seven thousand, four hundred eighty-one".