1216281 has 8 divisors (see below), whose sum is σ = 1769184. Its totient is φ = 737120.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216281 is 1826121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216281 - 2² = 1216277 is a prime.

It is a super-2 number, since 2×1216281² = 2958678941922, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1216681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18396 + ... + 18461.

It is an arithmetic number, because the mean of its divisors is an integer number (221148).

2^1216281 is an apocalyptic number.

1216281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1216281 is a deficient number, since it is larger than the sum of its proper divisors (552903).

1216281 is a wasteful number, since it uses less digits than its factorization.

1216281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36871.

The product of its digits is 192, while the sum is 21.

The square root of 1216281 is about 1102.8513045737. The cubic root of 1216281 is about 106.7442870356.

The spelling of 1216281 in words is "one million, two hundred sixteen thousand, two hundred eighty-one".