90231289 has 4 divisors (see below), whose sum is σ = 90302580. Its totient is φ = 90160000.

The previous prime is 90231259. The next prime is 90231293. The reversal of 90231289 is 98213209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98213209 = 5399 ⋅18191.

It can be written as a sum of positive squares in 2 ways, for example, as 75829264 + 14402025 = 8708^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 90231289 - 2¹⁹ = 89707001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90231259) 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, 33712 + ... + 36289.

It is an arithmetic number, because the mean of its divisors is an integer number (22575645).

Almost surely, 2^90231289 is an apocalyptic number.

It is an amenable number.

90231289 is a deficient number, since it is larger than the sum of its proper divisors (71291).

90231289 is a wasteful number, since it uses less digits than its factorization.

90231289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71290.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 90231289 is about 9499.0151594784. The cubic root of 90231289 is about 448.5240350244.

The spelling of 90231289 in words is "ninety million, two hundred thirty-one thousand, two hundred eighty-nine".