1281135 has 16 divisors (see below), whose sum is σ = 2064384. Its totient is φ = 678432.

The previous prime is 1281131. The next prime is 1281149. The reversal of 1281135 is 5311821.

It is not a de Polignac number, because 1281135 - 2² = 1281131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3154 + ... + 3536.

It is an arithmetic number, because the mean of its divisors is an integer number (129024).

2^1281135 is an apocalyptic number.

1281135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281135 is a deficient number, since it is larger than the sum of its proper divisors (783249).

1281135 is a wasteful number, since it uses less digits than its factorization.

1281135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its digits is 240, while the sum is 21.

The square root of 1281135 is about 1131.8723426253. The cubic root of 1281135 is about 108.6087875161.

Adding to 1281135 its reverse (5311821), we get a palindrome (6592956).

The spelling of 1281135 in words is "one million, two hundred eighty-one thousand, one hundred thirty-five".