1205121 has 4 divisors (see below), whose sum is σ = 1606832. Its totient is φ = 803412.

The previous prime is 1205119. The next prime is 1205123. The reversal of 1205121 is 1215021.

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 an interprime number because it is at equal distance from previous prime (1205119) and next prime (1205123).

It is not a de Polignac number, because 1205121 - 2¹ = 1205119 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205097 and 1205106.

It is not an unprimeable number, because it can be changed into a prime (1205123) 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, 200851 + ... + 200856.

It is an arithmetic number, because the mean of its divisors is an integer number (401708).

2^1205121 is an apocalyptic number.

It is an amenable number.

1205121 is a deficient number, since it is larger than the sum of its proper divisors (401711).

1205121 is an equidigital number, since it uses as much as digits as its factorization.

1205121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401710.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1205121 is about 1097.7800326113. The cubic root of 1205121 is about 106.4168055785.

It can be divided in two parts, 1205 and 121, that added together give a triangular number (1326 = T₅₁).

The spelling of 1205121 in words is "one million, two hundred five thousand, one hundred twenty-one".