91641494641 has 2 divisors, whose sum is σ = 91641494642. Its totient is φ = 91641494640.

The previous prime is 91641494639. The next prime is 91641494671. The reversal of 91641494641 is 14649414619.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88325462416 + 3316032225 = 297196^2 + 57585^2 .

It is a cyclic number.

It is not a de Polignac number, because 91641494641 - 2¹ = 91641494639 is a prime.

Together with 91641494639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91641494611) 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 as a sum of consecutive naturals, namely, 45820747320 + 45820747321.

It is an arithmetic number, because the mean of its divisors is an integer number (45820747321).

Almost surely, 2^91641494641 is an apocalyptic number.

It is an amenable number.

91641494641 is a deficient number, since it is larger than the sum of its proper divisors (1).

91641494641 is an equidigital number, since it uses as much as digits as its factorization.

91641494641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 49.

The spelling of 91641494641 in words is "ninety-one billion, six hundred forty-one million, four hundred ninety-four thousand, six hundred forty-one".