90243081 has 6 divisors (see below), whose sum is σ = 130351130. Its totient is φ = 60162048.

The previous prime is 90243079. The next prime is 90243113. The reversal of 90243081 is 18034209.

It can be written as a sum of positive squares in only one way, i.e., 86322681 + 3920400 = 9291^2 + 1980^2 .

It is not a de Polignac number, because 90243081 - 2¹ = 90243079 is a prime.

It is a super-2 number, since 2×90243081² = 16287627336745122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90243001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5013496 + ... + 5013513.

Almost surely, 2^90243081 is an apocalyptic number.

It is an amenable number.

90243081 is a deficient number, since it is larger than the sum of its proper divisors (40108049).

90243081 is a wasteful number, since it uses less digits than its factorization.

90243081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10027015 (or 10027012 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 90243081 is about 9499.6358351255. The cubic root of 90243081 is about 448.5435728333.

The spelling of 90243081 in words is "ninety million, two hundred forty-three thousand, eighty-one".