1282261121 has 4 divisors (see below), whose sum is σ = 1282354500. Its totient is φ = 1282167744.

The previous prime is 1282261103. The next prime is 1282261157. The reversal of 1282261121 is 1211622821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1211622821 = 13879 ⋅87299.

It can be written as a sum of positive squares in 2 ways, for example, as 1059177025 + 223084096 = 32545^2 + 14936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1282261121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1282261021) 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, 21596 + ... + 55053.

It is an arithmetic number, because the mean of its divisors is an integer number (320588625).

Almost surely, 2^1282261121 is an apocalyptic number.

It is an amenable number.

1282261121 is a deficient number, since it is larger than the sum of its proper divisors (93379).

1282261121 is an equidigital number, since it uses as much as digits as its factorization.

1282261121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93378.

The product of its digits is 768, while the sum is 26.

The square root of 1282261121 is about 35808.6738235305. The cubic root of 1282261121 is about 1086.4060066565.

Adding to 1282261121 its reverse (1211622821), we get a palindrome (2493883942).

The spelling of 1282261121 in words is "one billion, two hundred eighty-two million, two hundred sixty-one thousand, one hundred twenty-one".