91477871 has 2 divisors, whose sum is σ = 91477872. Its totient is φ = 91477870.

The previous prime is 91477843. The next prime is 91477873. The reversal of 91477871 is 17877419.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91477871 is a prime.

Together with 91477873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91477873) 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, 45738935 + 45738936.

It is an arithmetic number, because the mean of its divisors is an integer number (45738936).

Almost surely, 2^91477871 is an apocalyptic number.

91477871 is a deficient number, since it is larger than the sum of its proper divisors (1).

91477871 is an equidigital number, since it uses as much as digits as its factorization.

91477871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 44.

The square root of 91477871 is about 9564.4064635502. The cubic root of 91477871 is about 450.5801094541.

The spelling of 91477871 in words is "ninety-one million, four hundred seventy-seven thousand, eight hundred seventy-one".