91491163 has 2 divisors, whose sum is σ = 91491164. Its totient is φ = 91491162.

The previous prime is 91491157. The next prime is 91491193. The reversal of 91491163 is 36119419.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91491163 - 2¹³ = 91482971 is a prime.

It is not a weakly prime, because it can be changed into another prime (91491133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45745581 + 45745582.

It is an arithmetic number, because the mean of its divisors is an integer number (45745582).

Almost surely, 2^91491163 is an apocalyptic number.

91491163 is a deficient number, since it is larger than the sum of its proper divisors (1).

91491163 is an equidigital number, since it uses as much as digits as its factorization.

91491163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 91491163 is about 9565.1013063114. The cubic root of 91491163 is about 450.6019319295.

The spelling of 91491163 in words is "ninety-one million, four hundred ninety-one thousand, one hundred sixty-three".