920121 has 4 divisors (see below), whose sum is σ = 1226832. Its totient is φ = 613412.

The previous prime is 920107. The next prime is 920123. The reversal of 920121 is 121029.

It is a happy number.

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: 121029 = 3 ⋅40343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920121 is a prime.

It is a D-number.

920121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 920121.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 920121.

It is not an unprimeable number, because it can be changed into a prime (920123) 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, 153351 + ... + 153356.

It is an arithmetic number, because the mean of its divisors is an integer number (306708).

2⁹²⁰¹²¹ is an apocalyptic number.

It is an amenable number.

920121 is a deficient number, since it is larger than the sum of its proper divisors (306711).

920121 is a wasteful number, since it uses less digits than its factorization.

920121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306710.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 920121 is about 959.2293781990. The cubic root of 920121 is about 97.2631463208.

The spelling of 920121 in words is "nine hundred twenty thousand, one hundred twenty-one".