91888067 has 2 divisors, whose sum is σ = 91888068. Its totient is φ = 91888066.

The previous prime is 91888063. The next prime is 91888073. The reversal of 91888067 is 76088819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91888067 - 2² = 91888063 is a prime.

It is not a weakly prime, because it can be changed into another prime (91888063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45944033 + 45944034.

It is an arithmetic number, because the mean of its divisors is an integer number (45944034).

Almost surely, 2^91888067 is an apocalyptic number.

91888067 is a deficient number, since it is larger than the sum of its proper divisors (1).

91888067 is an equidigital number, since it uses as much as digits as its factorization.

91888067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 91888067 is about 9585.8263597877. The cubic root of 91888067 is about 451.2525875190.

The spelling of 91888067 in words is "ninety-one million, eight hundred eighty-eight thousand, sixty-seven".