90018001 has 8 divisors (see below), whose sum is σ = 95394600. Its totient is φ = 84792960.

The previous prime is 90017987. The next prime is 90018007. The reversal of 90018001 is 10081009.

It can be written as a sum of positive squares in 4 ways, for example, as 9000000 + 81018001 = 3000^2 + 9001^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90018001 - 2⁵ = 90017969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90018001.

It is not an unprimeable number, because it can be changed into a prime (90018007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36666 + ... + 39043.

It is an arithmetic number, because the mean of its divisors is an integer number (11924325).

Almost surely, 2^90018001 is an apocalyptic number.

It is an amenable number.

90018001 is a deficient number, since it is larger than the sum of its proper divisors (5376599).

90018001 is a wasteful number, since it uses less digits than its factorization.

90018001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75779.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 90018001 is about 9487.7816690731. The cubic root of 90018001 is about 448.1703503554.

The spelling of 90018001 in words is "ninety million, eighteen thousand, one".