91073147 has 4 divisors (see below), whose sum is σ = 99352536. Its totient is φ = 82793760.

The previous prime is 91073119. The next prime is 91073159. The reversal of 91073147 is 74137019.

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 91073147 - 2¹⁶ = 91007611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91073107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139678 + ... + 4139699.

It is an arithmetic number, because the mean of its divisors is an integer number (24838134).

Almost surely, 2^91073147 is an apocalyptic number.

91073147 is a deficient number, since it is larger than the sum of its proper divisors (8279389).

91073147 is a wasteful number, since it uses less digits than its factorization.

91073147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8279388.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 91073147 is about 9543.2251885827. The cubic root of 91073147 is about 449.9146290725.

The spelling of 91073147 in words is "ninety-one million, seventy-three thousand, one hundred forty-seven".