91424439 has 6 divisors (see below), whose sum is σ = 132057536. Its totient is φ = 60949620.

The previous prime is 91424423. The next prime is 91424441. The reversal of 91424439 is 93442419.

It is not a de Polignac number, because 91424439 - 2⁴ = 91424423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91424479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5079127 + ... + 5079144.

Almost surely, 2^91424439 is an apocalyptic number.

91424439 is a deficient number, since it is larger than the sum of its proper divisors (40633097).

91424439 is a wasteful number, since it uses less digits than its factorization.

91424439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10158277 (or 10158274 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 91424439 is about 9561.6127823710. The cubic root of 91424439 is about 450.4923647893.

The spelling of 91424439 in words is "ninety-one million, four hundred twenty-four thousand, four hundred thirty-nine".