91225547 has 4 divisors (see below), whose sum is σ = 104257776. Its totient is φ = 78193320.

The previous prime is 91225513. The next prime is 91225571. The reversal of 91225547 is 74552219.

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 91225547 - 2⁶ = 91225483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91225507) 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, 6516104 + ... + 6516117.

It is an arithmetic number, because the mean of its divisors is an integer number (26064444).

Almost surely, 2^91225547 is an apocalyptic number.

91225547 is a deficient number, since it is larger than the sum of its proper divisors (13032229).

91225547 is a wasteful number, since it uses less digits than its factorization.

91225547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13032228.

The product of its digits is 25200, while the sum is 35.

The square root of 91225547 is about 9551.2065729938. The cubic root of 91225547 is about 450.1654486281.

The spelling of 91225547 in words is "ninety-one million, two hundred twenty-five thousand, five hundred forty-seven".