91345643 has 2 divisors, whose sum is σ = 91345644. Its totient is φ = 91345642.

The previous prime is 91345619. The next prime is 91345729. The reversal of 91345643 is 34654319.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91345643 is a prime.

It is not a weakly prime, because it can be changed into another prime (91345613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45672821 + 45672822.

It is an arithmetic number, because the mean of its divisors is an integer number (45672822).

Almost surely, 2^91345643 is an apocalyptic number.

91345643 is a deficient number, since it is larger than the sum of its proper divisors (1).

91345643 is an equidigital number, since it uses as much as digits as its factorization.

91345643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 91345643 is about 9557.4914595829. The cubic root of 91345643 is about 450.3629056075.

The spelling of 91345643 in words is "ninety-one million, three hundred forty-five thousand, six hundred forty-three".