1213281 has 12 divisors (see below), whose sum is σ = 1769508. Its totient is φ = 801024.

The previous prime is 1213271. The next prime is 1213301. The reversal of 1213281 is 1823121.

It can be written as a sum of positive squares in 2 ways, for example, as 245025 + 968256 = 495^2 + 984^2 .

It is not a de Polignac number, because 1213281 - 2⁷ = 1213153 is a prime.

It is a super-2 number, since 2×1213281² = 2944101569922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213241) 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, 421 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (147459).

2^1213281 is an apocalyptic number.

It is an amenable number.

1213281 is a deficient number, since it is larger than the sum of its proper divisors (556227).

1213281 is a wasteful number, since it uses less digits than its factorization.

1213281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312 (or 1309 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1213281 is about 1101.4903540204. The cubic root of 1213281 is about 106.6564519298.

The spelling of 1213281 in words is "one million, two hundred thirteen thousand, two hundred eighty-one".