91393871 has 2 divisors, whose sum is σ = 91393872. Its totient is φ = 91393870.

The previous prime is 91393867. The next prime is 91393903. The reversal of 91393871 is 17839319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91393871 - 2² = 91393867 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91393801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45696935 + 45696936.

It is an arithmetic number, because the mean of its divisors is an integer number (45696936).

Almost surely, 2^91393871 is an apocalyptic number.

91393871 is a deficient number, since it is larger than the sum of its proper divisors (1).

91393871 is an equidigital number, since it uses as much as digits as its factorization.

91393871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 91393871 is about 9560.0141736297. The cubic root of 91393871 is about 450.4421514262.

The spelling of 91393871 in words is "ninety-one million, three hundred ninety-three thousand, eight hundred seventy-one".