91308643 has 16 divisors (see below), whose sum is σ = 97708032. Its totient is φ = 85140000.

The previous prime is 91308629. The next prime is 91308647. The reversal of 91308643 is 34680319.

It is a cyclic number.

It is not a de Polignac number, because 91308643 - 2⁹ = 91308131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91308599 and 91308608.

It is not an unprimeable number, because it can be changed into a prime (91308647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211638 + ... + 212068.

It is an arithmetic number, because the mean of its divisors is an integer number (6106752).

Almost surely, 2^91308643 is an apocalyptic number.

91308643 is a deficient number, since it is larger than the sum of its proper divisors (6399389).

91308643 is a wasteful number, since it uses less digits than its factorization.

91308643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 91308643 is about 9555.5556091731. Note that the first 3 decimals coincide. The cubic root of 91308643 is about 450.3020901621.

The spelling of 91308643 in words is "ninety-one million, three hundred eight thousand, six hundred forty-three".