1281249 has 12 divisors (see below), whose sum is σ = 1914900. Its totient is φ = 824544.

The previous prime is 1281229. The next prime is 1281253. The reversal of 1281249 is 9421821.

It can be written as a sum of positive squares in 2 ways, for example, as 1065024 + 216225 = 1032^2 + 465^2 .

It is not a de Polignac number, because 1281249 - 2⁹ = 1280737 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2194 + ... + 2715.

It is an arithmetic number, because the mean of its divisors is an integer number (159575).

2^1281249 is an apocalyptic number.

It is an amenable number.

1281249 is a deficient number, since it is larger than the sum of its proper divisors (633651).

1281249 is a wasteful number, since it uses less digits than its factorization.

1281249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944 (or 4941 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1281249 is about 1131.9227005410. The cubic root of 1281249 is about 108.6120088874.

Adding to 1281249 its product of digits (1152), we get a triangular number (1282401 = T₁₆₀₁).

The spelling of 1281249 in words is "one million, two hundred eighty-one thousand, two hundred forty-nine".