91758477493 has 2 divisors, whose sum is σ = 91758477494. Its totient is φ = 91758477492.

The previous prime is 91758477443. The next prime is 91758477509. The reversal of 91758477493 is 39477485719.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85119813009 + 6638664484 = 291753^2 + 81478^2 .

It is a cyclic number.

It is not a de Polignac number, because 91758477493 - 2²⁵ = 91724923061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91758477443) 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, 45879238746 + 45879238747.

It is an arithmetic number, because the mean of its divisors is an integer number (45879238747).

Almost surely, 2^91758477493 is an apocalyptic number.

It is an amenable number.

91758477493 is a deficient number, since it is larger than the sum of its proper divisors (1).

91758477493 is an equidigital number, since it uses as much as digits as its factorization.

91758477493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53343360, while the sum is 64.

The spelling of 91758477493 in words is "ninety-one billion, seven hundred fifty-eight million, four hundred seventy-seven thousand, four hundred ninety-three".