91664543 has 2 divisors, whose sum is σ = 91664544. Its totient is φ = 91664542.

The previous prime is 91664497. The next prime is 91664579. The reversal of 91664543 is 34546619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91664543 - 2¹⁴ = 91648159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91664497 and 91664506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91664743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45832271 + 45832272.

It is an arithmetic number, because the mean of its divisors is an integer number (45832272).

Almost surely, 2^91664543 is an apocalyptic number.

91664543 is a deficient number, since it is larger than the sum of its proper divisors (1).

91664543 is an equidigital number, since it uses as much as digits as its factorization.

91664543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 91664543 is about 9574.1601720464. The cubic root of 91664543 is about 450.8863895094.

The spelling of 91664543 in words is "ninety-one million, six hundred sixty-four thousand, five hundred forty-three".