1281158 has 4 divisors (see below), whose sum is σ = 1921740. Its totient is φ = 640578.

The previous prime is 1281157. The next prime is 1281167. The reversal of 1281158 is 8511821.

1281158 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320288 + ... + 320291.

It is an arithmetic number, because the mean of its divisors is an integer number (480435).

2^1281158 is an apocalyptic number.

1281158 is a deficient number, since it is larger than the sum of its proper divisors (640582).

1281158 is an equidigital number, since it uses as much as digits as its factorization.

1281158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640581.

The product of its digits is 640, while the sum is 26.

The square root of 1281158 is about 1131.8825027360. The cubic root of 1281158 is about 108.6094374573.

Adding to 1281158 its reverse (8511821), we get a palindrome (9792979).

The spelling of 1281158 in words is "one million, two hundred eighty-one thousand, one hundred fifty-eight".