91850008477 has 2 divisors, whose sum is σ = 91850008478. Its totient is φ = 91850008476.

The previous prime is 91850008417. The next prime is 91850008489. The reversal of 91850008477 is 77480005819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90489062596 + 1360945881 = 300814^2 + 36891^2 .

It is a cyclic number.

It is not a de Polignac number, because 91850008477 - 2³¹ = 89702524829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91850008477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91850008417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925004238 + 45925004239.

It is an arithmetic number, because the mean of its divisors is an integer number (45925004239).

Almost surely, 2^91850008477 is an apocalyptic number.

It is an amenable number.

91850008477 is a deficient number, since it is larger than the sum of its proper divisors (1).

91850008477 is an equidigital number, since it uses as much as digits as its factorization.

91850008477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 91850008477 in words is "ninety-one billion, eight hundred fifty million, eight thousand, four hundred seventy-seven".