91543867 has 2 divisors, whose sum is σ = 91543868. Its totient is φ = 91543866.

The previous prime is 91543853. The next prime is 91543877. The reversal of 91543867 is 76834519.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91543867 is a prime.

It is not a weakly prime, because it can be changed into another prime (91543877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45771933 + 45771934.

It is an arithmetic number, because the mean of its divisors is an integer number (45771934).

Almost surely, 2^91543867 is an apocalyptic number.

91543867 is a deficient number, since it is larger than the sum of its proper divisors (1).

91543867 is an equidigital number, since it uses as much as digits as its factorization.

91543867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 91543867 is about 9567.8559249186. The cubic root of 91543867 is about 450.6884392479.

The spelling of 91543867 in words is "ninety-one million, five hundred forty-three thousand, eight hundred sixty-seven".