90150221 has 4 divisors (see below), whose sum is σ = 103028832. Its totient is φ = 77271612.

The previous prime is 90150217. The next prime is 90150227. The reversal of 90150221 is 12205109.

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 90150221 - 2² = 90150217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90150193 and 90150202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90150227) 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, 6439295 + ... + 6439308.

It is an arithmetic number, because the mean of its divisors is an integer number (25757208).

Almost surely, 2^90150221 is an apocalyptic number.

It is an amenable number.

90150221 is a deficient number, since it is larger than the sum of its proper divisors (12878611).

90150221 is a wasteful number, since it uses less digits than its factorization.

90150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878610.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 90150221 is about 9494.7470213798. The cubic root of 90150221 is about 448.3896698030.

The spelling of 90150221 in words is "ninety million, one hundred fifty thousand, two hundred twenty-one".