91477173365849 has 2 divisors, whose sum is σ = 91477173365850. Its totient is φ = 91477173365848.

The previous prime is 91477173365827. The next prime is 91477173365873. The reversal of 91477173365849 is 94856337177419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62036999591449 + 29440173774400 = 7876357^2 + 5425880^2 .

It is a cyclic number.

It is not a de Polignac number, because 91477173365849 - 2¹⁶ = 91477173300313 is a prime.

It is not a weakly prime, because it can be changed into another prime (91477173367849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45738586682924 + 45738586682925.

It is an arithmetic number, because the mean of its divisors is an integer number (45738586682925).

Almost surely, 2^{91477173365849} is an apocalyptic number.

It is an amenable number.

91477173365849 is a deficient number, since it is larger than the sum of its proper divisors (1).

91477173365849 is an equidigital number, since it uses as much as digits as its factorization.

91477173365849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960180480, while the sum is 74.

The spelling of 91477173365849 in words is "ninety-one trillion, four hundred seventy-seven billion, one hundred seventy-three million, three hundred sixty-five thousand, eight hundred forty-nine".