90051009 has 4 divisors (see below), whose sum is σ = 120068016. Its totient is φ = 60034004.

The previous prime is 90050999. The next prime is 90051029. The reversal of 90051009 is 90015009.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 90051009 - 2⁵ = 90050977 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90051009.

It is not an unprimeable number, because it can be changed into a prime (90051029) 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, 15008499 + ... + 15008504.

It is an arithmetic number, because the mean of its divisors is an integer number (30017004).

Almost surely, 2^90051009 is an apocalyptic number.

It is an amenable number.

90051009 is a deficient number, since it is larger than the sum of its proper divisors (30017007).

90051009 is a wasteful number, since it uses less digits than its factorization.

90051009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30017006.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 90051009 is about 9489.5210100405. The cubic root of 90051009 is about 448.2251223602.

The spelling of 90051009 in words is "ninety million, fifty-one thousand, nine".