91227643 has 4 divisors (see below), whose sum is σ = 98245168. Its totient is φ = 84210120.

The previous prime is 91227557. The next prime is 91227667. The reversal of 91227643 is 34672219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91227643 - 2¹⁷ = 91096571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91227599 and 91227608.

It is not an unprimeable number, because it can be changed into a prime (91227673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3508743 + ... + 3508768.

It is an arithmetic number, because the mean of its divisors is an integer number (24561292).

Almost surely, 2^91227643 is an apocalyptic number.

91227643 is a deficient number, since it is larger than the sum of its proper divisors (7017525).

91227643 is a wasteful number, since it uses less digits than its factorization.

91227643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7017524.

The product of its digits is 18144, while the sum is 34.

The square root of 91227643 is about 9551.3162967206. The cubic root of 91227643 is about 450.1688962718.

The spelling of 91227643 in words is "ninety-one million, two hundred twenty-seven thousand, six hundred forty-three".