1216481 has 4 divisors (see below), whose sum is σ = 1390272. Its totient is φ = 1042692.

The previous prime is 1216459. The next prime is 1216489. The reversal of 1216481 is 1846121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1216481 - 2⁶ = 1216417 is a prime.

It is a super-2 number, since 2×1216481² = 2959652046722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86885 + ... + 86898.

It is an arithmetic number, because the mean of its divisors is an integer number (347568).

2^1216481 is an apocalyptic number.

It is an amenable number.

1216481 is a deficient number, since it is larger than the sum of its proper divisors (173791).

1216481 is an equidigital number, since it uses as much as digits as its factorization.

1216481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173790.

The product of its digits is 384, while the sum is 23.

The square root of 1216481 is about 1102.9419749017. The cubic root of 1216481 is about 106.7501375716.

The spelling of 1216481 in words is "one million, two hundred sixteen thousand, four hundred eighty-one".