91164947 has 2 divisors, whose sum is σ = 91164948. Its totient is φ = 91164946.

The previous prime is 91164937. The next prime is 91164961. The reversal of 91164947 is 74946119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91164947 - 2⁶ = 91164883 is a prime.

It is a super-2 number, since 2×91164947² = 16622095123025618, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91164917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45582473 + 45582474.

It is an arithmetic number, because the mean of its divisors is an integer number (45582474).

Almost surely, 2^91164947 is an apocalyptic number.

91164947 is a deficient number, since it is larger than the sum of its proper divisors (1).

91164947 is an equidigital number, since it uses as much as digits as its factorization.

91164947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 91164947 is about 9548.0336719138. The cubic root of 91164947 is about 450.0657467723.

The spelling of 91164947 in words is "ninety-one million, one hundred sixty-four thousand, nine hundred forty-seven".