1281161 has 4 divisors (see below), whose sum is σ = 1464192. Its totient is φ = 1098132.

The previous prime is 1281157. The next prime is 1281167. The reversal of 1281161 is 1611821.

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 not a de Polignac number, because 1281161 - 2² = 1281157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1281167) 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, 91505 + ... + 91518.

It is an arithmetic number, because the mean of its divisors is an integer number (366048).

2^1281161 is an apocalyptic number.

It is an amenable number.

1281161 is a deficient number, since it is larger than the sum of its proper divisors (183031).

1281161 is an equidigital number, since it uses as much as digits as its factorization.

1281161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183030.

The product of its digits is 96, while the sum is 20.

The square root of 1281161 is about 1131.8838279612. The cubic root of 1281161 is about 108.6095222317.

Adding to 1281161 its reverse (1611821), we get a palindrome (2892982).

The spelling of 1281161 in words is "one million, two hundred eighty-one thousand, one hundred sixty-one".