1281151 has 4 divisors (see below), whose sum is σ = 1348600. Its totient is φ = 1213704.

The previous prime is 1281149. The next prime is 1281157. The reversal of 1281151 is 1511821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1281151 - 2¹ = 1281149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 67429 = 1281151 / (1 + 2 + 8 + 1 + 1 + 5 + 1).

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33696 + ... + 33733.

It is an arithmetic number, because the mean of its divisors is an integer number (337150).

2^1281151 is an apocalyptic number.

1281151 is a deficient number, since it is larger than the sum of its proper divisors (67449).

1281151 is an equidigital number, since it uses as much as digits as its factorization.

1281151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67448.

The product of its digits is 80, while the sum is 19.

The square root of 1281151 is about 1131.8794105381. The cubic root of 1281151 is about 108.6092396499.

Adding to 1281151 its reverse (1511821), we get a palindrome (2792972).

The spelling of 1281151 in words is "one million, two hundred eighty-one thousand, one hundred fifty-one".