90009121 has 4 divisors (see below), whose sum is σ = 90190000. Its totient is φ = 89828244.

The previous prime is 90009119. The next prime is 90009167. The reversal of 90009121 is 12190009.

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: 12190009 = 13 ⋅937693.

It is a cyclic number.

It is not a de Polignac number, because 90009121 - 2¹ = 90009119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90009092 and 90009101.

It is not an unprimeable number, because it can be changed into a prime (90009421) 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, 89691 + ... + 90688.

It is an arithmetic number, because the mean of its divisors is an integer number (22547500).

Almost surely, 2^90009121 is an apocalyptic number.

It is an amenable number.

90009121 is a deficient number, since it is larger than the sum of its proper divisors (180879).

90009121 is a wasteful number, since it uses less digits than its factorization.

90009121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180878.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 90009121 is about 9487.3136872352. The cubic root of 90009121 is about 448.1556129935.

The spelling of 90009121 in words is "ninety million, nine thousand, one hundred twenty-one".