91854009 has 24 divisors (see below), whose sum is σ = 151292232. Its totient is φ = 53199360.

The previous prime is 91853989. The next prime is 91854047. The reversal of 91854009 is 90045819.

It can be written as a sum of positive squares in 4 ways, for example, as 21344400 + 70509609 = 4620^2 + 8397^2 .

It is not a de Polignac number, because 91854009 - 2⁹ = 91853497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91854079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21102 + ... + 25079.

It is an arithmetic number, because the mean of its divisors is an integer number (6303843).

Almost surely, 2^91854009 is an apocalyptic number.

It is an amenable number.

91854009 is a deficient number, since it is larger than the sum of its proper divisors (59438223).

91854009 is a wasteful number, since it uses less digits than its factorization.

91854009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46217 (or 46214 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 91854009 is about 9584.0497181515. The cubic root of 91854009 is about 451.1968288831.

The spelling of 91854009 in words is "ninety-one million, eight hundred fifty-four thousand, nine".