91424873 has 4 divisors (see below), whose sum is σ = 91478100. Its totient is φ = 91371648.

The previous prime is 91424869. The next prime is 91424881. The reversal of 91424873 is 37842419.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37063744 + 54361129 = 6088^2 + 7373^2 .

It is a cyclic number.

It is not a de Polignac number, because 91424873 - 2² = 91424869 is a prime.

It is a super-3 number, since 3×91424873³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91424833) 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, 23948 + ... + 27501.

It is an arithmetic number, because the mean of its divisors is an integer number (22869525).

Almost surely, 2^91424873 is an apocalyptic number.

It is an amenable number.

91424873 is a deficient number, since it is larger than the sum of its proper divisors (53227).

91424873 is a wasteful number, since it uses less digits than its factorization.

91424873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53226.

The product of its digits is 48384, while the sum is 38.

The square root of 91424873 is about 9561.6354772602. The cubic root of 91424873 is about 450.4930776307.

The spelling of 91424873 in words is "ninety-one million, four hundred twenty-four thousand, eight hundred seventy-three".