1280121 has 4 divisors (see below), whose sum is σ = 1706832. Its totient is φ = 853412.

The previous prime is 1280119. The next prime is 1280129. The reversal of 1280121 is 1210821.

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: 1210821 = 3 ⋅403607.

It is a cyclic number.

It is not a de Polignac number, because 1280121 - 2¹ = 1280119 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280121.

It is not an unprimeable number, because it can be changed into a prime (1280129) 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, 213351 + ... + 213356.

It is an arithmetic number, because the mean of its divisors is an integer number (426708).

2^1280121 is an apocalyptic number.

It is an amenable number.

1280121 is a deficient number, since it is larger than the sum of its proper divisors (426711).

1280121 is an equidigital number, since it uses as much as digits as its factorization.

1280121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426710.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1280121 is about 1131.4243235851. The cubic root of 1280121 is about 108.5801258532.

Adding to 1280121 its reverse (1210821), we get a palindrome (2490942).

The spelling of 1280121 in words is "one million, two hundred eighty thousand, one hundred twenty-one".