90121506 has 8 divisors (see below), whose sum is σ = 180243024. Its totient is φ = 30040500.

The previous prime is 90121469. The next prime is 90121511. The reversal of 90121506 is 60512109.

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

90121506 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7510120 + ... + 7510131.

It is an arithmetic number, because the mean of its divisors is an integer number (22530378).

Almost surely, 2^90121506 is an apocalyptic number.

90121506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90121506 is a wasteful number, since it uses less digits than its factorization.

90121506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15020256.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 90121506 is about 9493.2347490200. The cubic root of 90121506 is about 448.3420571386.

The spelling of 90121506 in words is "ninety million, one hundred twenty-one thousand, five hundred six".