1200121 has 4 divisors (see below), whose sum is σ = 1292452.
Its totient is φ = 1107792.
The previous prime is 1200109. The next prime is 1200139. The reversal of 1200121 is 1210021.
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 622521 + 577600 = 789^2 + 760^2
It is a cyclic number.
It is not a de Polignac number, because 1200121 - 27 = 1199993 is a prime.
It is the 1096-th Hogben number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1200161) by changing a digit.
It is a nontrivial repunit in base 1095.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46146 + ... + 46171.
It is an arithmetic number, because the mean of its divisors is an integer number (323113).
21200121 is an apocalyptic number.
It is an amenable number.
1200121 is a deficient number, since it is larger than the sum of its proper divisors (92331).
1200121 is an equidigital number, since it uses as much as digits as its factorization.
1200121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 92330.
The product of its (nonzero) digits is 4, while the sum is 7.
The square root of 1200121 is about 1095.5003423094.
The cubic root of 1200121 is about 106.2694285117.
Adding to 1200121 its reverse (1210021), we get a palindrome (2410142).
The spelling of 1200121 in words is "one million, two hundred thousand, one hundred twenty-one".