91840871 has 2 divisors, whose sum is σ = 91840872. Its totient is φ = 91840870.

The previous prime is 91840849. The next prime is 91840907. The reversal of 91840871 is 17804819.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91840871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91848871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45920435 + 45920436.

It is an arithmetic number, because the mean of its divisors is an integer number (45920436).

Almost surely, 2^91840871 is an apocalyptic number.

91840871 is a deficient number, since it is larger than the sum of its proper divisors (1).

91840871 is an equidigital number, since it uses as much as digits as its factorization.

91840871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 91840871 is about 9583.3642840080. The cubic root of 91840871 is about 451.1753160984.

The spelling of 91840871 in words is "ninety-one million, eight hundred forty thousand, eight hundred seventy-one".