90555121 has 4 divisors (see below), whose sum is σ = 95321200. Its totient is φ = 85789044.

The previous prime is 90555103. The next prime is 90555131. The reversal of 90555121 is 12155509.

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 90555121 - 2⁷ = 90554993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90555121.

It is not an unprimeable number, because it can be changed into a prime (90555131) 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, 2383011 + ... + 2383048.

It is an arithmetic number, because the mean of its divisors is an integer number (23830300).

Almost surely, 2^90555121 is an apocalyptic number.

It is an amenable number.

90555121 is a deficient number, since it is larger than the sum of its proper divisors (4766079).

90555121 is a wasteful number, since it uses less digits than its factorization.

90555121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766078.

The product of its (nonzero) digits is 2250, while the sum is 28.

The square root of 90555121 is about 9516.0454496603. The cubic root of 90555121 is about 449.0599652386.

The spelling of 90555121 in words is "ninety million, five hundred fifty-five thousand, one hundred twenty-one".