90530509 has 4 divisors (see below), whose sum is σ = 93450880. Its totient is φ = 87610140.

The previous prime is 90530483. The next prime is 90530513. The reversal of 90530509 is 90503509.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90503509 = 599 ⋅151091.

It is a cyclic number.

It is not a de Polignac number, because 90530509 - 2⁵ = 90530477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2920339 = 90530509 / (9 + 0 + 5 + 3 + 0 + 5 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90530569) 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, 1460139 + ... + 1460200.

It is an arithmetic number, because the mean of its divisors is an integer number (23362720).

Almost surely, 2^90530509 is an apocalyptic number.

It is an amenable number.

90530509 is a deficient number, since it is larger than the sum of its proper divisors (2920371).

90530509 is a wasteful number, since it uses less digits than its factorization.

90530509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920370.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 90530509 is about 9514.7521775399. The cubic root of 90530509 is about 449.0192781772.

Subtracting from 90530509 its reverse (90503509), we obtain a cube (27000 = 30³).

The spelling of 90530509 in words is "ninety million, five hundred thirty thousand, five hundred nine".