90003281 has 4 divisors (see below), whose sum is σ = 90024000. Its totient is φ = 89982564.

The previous prime is 90003259. The next prime is 90003289. The reversal of 90003281 is 18230009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90003281 is a prime.

It is a super-2 number, since 2×90003281² = 16201181181529922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90003289) 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, 1061 + ... + 13458.

It is an arithmetic number, because the mean of its divisors is an integer number (22506000).

Almost surely, 2^90003281 is an apocalyptic number.

It is an amenable number.

90003281 is a deficient number, since it is larger than the sum of its proper divisors (20719).

90003281 is a wasteful number, since it uses less digits than its factorization.

90003281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20718.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 90003281 is about 9487.0059028125. The cubic root of 90003281 is about 448.1459203262.

The spelling of 90003281 in words is "ninety million, three thousand, two hundred eighty-one".