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BaseRepresentation
bin100010010101…
…010010011011
3121221020210201
4202111102123
54301000331
6520523031
7136333222
oct42252233
917836721
109000091
1150979a1
123020477
131b316c9
1412a3cb9
15bcba61
hex89549b

9000091 has 12 divisors (see below), whose sum is σ = 9628632. Its totient is φ = 8410464.

The previous prime is 9000067. The next prime is 9000119. The reversal of 9000091 is 1900009.

It is not a de Polignac number, because 9000091 - 25 = 9000059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an Ulam number.

It is a Duffinian number.

9000091 is a modest number, since divided by 91 gives 9 as remainder.

It is not an unprimeable number, because it can be changed into a prime (9000011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38511 + ... + 38743.

It is an arithmetic number, because the mean of its divisors is an integer number (802386).

Almost surely, 29000091 is an apocalyptic number.

9000091 is a deficient number, since it is larger than the sum of its proper divisors (628541).

9000091 is a wasteful number, since it uses less digits than its factorization.

9000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 9000091 is about 3000.0151666283. The cubic root of 9000091 is about 208.0090833681.

The spelling of 9000091 in words is "nine million, ninety-one", and thus it is an aban number and an uban number.