91823899477 has 2 divisors, whose sum is σ = 91823899478. Its totient is φ = 91823899476.

The previous prime is 91823899393. The next prime is 91823899499. The reversal of 91823899477 is 77499832819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74163084241 + 17660815236 = 272329^2 + 132894^2 .

It is a cyclic number.

It is not a de Polignac number, because 91823899477 - 2¹⁵ = 91823866709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91823899877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45911949738 + 45911949739.

It is an arithmetic number, because the mean of its divisors is an integer number (45911949739).

Almost surely, 2^91823899477 is an apocalyptic number.

It is an amenable number.

91823899477 is a deficient number, since it is larger than the sum of its proper divisors (1).

91823899477 is an equidigital number, since it uses as much as digits as its factorization.

91823899477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 67.

The spelling of 91823899477 in words is "ninety-one billion, eight hundred twenty-three million, eight hundred ninety-nine thousand, four hundred seventy-seven".