91477173496879 has 2 divisors, whose sum is σ = 91477173496880. Its totient is φ = 91477173496878.

The previous prime is 91477173496859. The next prime is 91477173496921. The reversal of 91477173496879 is 97869437177419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91477173496879 - 2⁹ = 91477173496367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91477173496859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45738586748439 + 45738586748440.

It is an arithmetic number, because the mean of its divisors is an integer number (45738586748440).

Almost surely, 2^{91477173496879} is an apocalyptic number.

91477173496879 is a deficient number, since it is larger than the sum of its proper divisors (1).

91477173496879 is an equidigital number, since it uses as much as digits as its factorization.

91477173496879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032758016, while the sum is 82.

The spelling of 91477173496879 in words is "ninety-one trillion, four hundred seventy-seven billion, one hundred seventy-three million, four hundred ninety-six thousand, eight hundred seventy-nine".