90530989 has 4 divisors (see below), whose sum is σ = 90565020. Its totient is φ = 90496960.

The previous prime is 90530983. The next prime is 90531053. The reversal of 90530989 is 98903509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98903509 = 61 ⋅1621369.

It can be written as a sum of positive squares in 2 ways, for example, as 64673764 + 25857225 = 8042^2 + 5085^2 .

It is a cyclic number.

It is not a de Polignac number, because 90530989 - 2³ = 90530981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90530981) 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, 12652 + ... + 18469.

It is an arithmetic number, because the mean of its divisors is an integer number (22641255).

Almost surely, 2^90530989 is an apocalyptic number.

It is an amenable number.

90530989 is a deficient number, since it is larger than the sum of its proper divisors (34031).

90530989 is a wasteful number, since it uses less digits than its factorization.

90530989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34030.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 90530989 is about 9514.7774014950. Note that the first 3 decimals coincide. The cubic root of 90530989 is about 449.0200717545.

It can be divided in two parts, 90530 and 989, that added together give a palindrome (91519).

The spelling of 90530989 in words is "ninety million, five hundred thirty thousand, nine hundred eighty-nine".