90430121 has 4 divisors (see below), whose sum is σ = 91912644. Its totient is φ = 88947600.

The previous prime is 90430117. The next prime is 90430127. The reversal of 90430121 is 12103409.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12355225 + 78074896 = 3515^2 + 8836^2 .

It is a cyclic number.

It is not a de Polignac number, because 90430121 - 2² = 90430117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90430093 and 90430102.

It is not an unprimeable number, because it can be changed into a prime (90430127) 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, 741170 + ... + 741291.

It is an arithmetic number, because the mean of its divisors is an integer number (22978161).

Almost surely, 2^90430121 is an apocalyptic number.

It is an amenable number.

90430121 is a deficient number, since it is larger than the sum of its proper divisors (1482523).

90430121 is a wasteful number, since it uses less digits than its factorization.

90430121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482522.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 90430121 is about 9509.4753272723. The cubic root of 90430121 is about 448.8532464180.

The spelling of 90430121 in words is "ninety million, four hundred thirty thousand, one hundred twenty-one".