90318281 has 8 divisors (see below), whose sum is σ = 90986280. Its totient is φ = 89653248.

The previous prime is 90318271. The next prime is 90318313. The reversal of 90318281 is 18281309.

It can be written as a sum of positive squares in 4 ways, for example, as 52998400 + 37319881 = 7280^2 + 6109^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90318281 is a prime.

It is a super-2 number, since 2×90318281² = 16314783765589922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90318271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117065 + ... + 117833.

It is an arithmetic number, because the mean of its divisors is an integer number (11373285).

Almost surely, 2^90318281 is an apocalyptic number.

It is an amenable number.

90318281 is a deficient number, since it is larger than the sum of its proper divisors (667999).

90318281 is a wasteful number, since it uses less digits than its factorization.

90318281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 90318281 is about 9503.5930573652. The cubic root of 90318281 is about 448.6681294249.

The spelling of 90318281 in words is "ninety million, three hundred eighteen thousand, two hundred eighty-one".