91640467 has 2 divisors, whose sum is σ = 91640468. Its totient is φ = 91640466.

The previous prime is 91640447. The next prime is 91640473. The reversal of 91640467 is 76404619.

It is a strong prime.

It is an emirp because it is prime and its reverse (76404619) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91640467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91640447) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45820233 + 45820234.

It is an arithmetic number, because the mean of its divisors is an integer number (45820234).

Almost surely, 2^91640467 is an apocalyptic number.

91640467 is a deficient number, since it is larger than the sum of its proper divisors (1).

91640467 is an equidigital number, since it uses as much as digits as its factorization.

91640467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 91640467 is about 9572.9027468161. The cubic root of 91640467 is about 450.8469104448.

The spelling of 91640467 in words is "ninety-one million, six hundred forty thousand, four hundred sixty-seven".