905121 has 16 divisors (see below), whose sum is σ = 1532800. Its totient is φ = 517104.

The previous prime is 905111. The next prime is 905123. The reversal of 905121 is 121509.

905121 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 905121 - 2¹⁰ = 904097 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 = 905094 and 905103.

It is not an unprimeable number, because it can be changed into a prime (905123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2206 + ... + 2583.

It is an arithmetic number, because the mean of its divisors is an integer number (95800).

2⁹⁰⁵¹²¹ is an apocalyptic number.

It is an amenable number.

905121 is a deficient number, since it is larger than the sum of its proper divisors (627679).

905121 is a wasteful number, since it uses less digits than its factorization.

905121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805 (or 4799 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 905121 is about 951.3784735845. The cubic root of 905121 is about 96.7317133878.

The spelling of 905121 in words is "nine hundred five thousand, one hundred twenty-one".