1216431 has 8 divisors (see below), whose sum is σ = 1802160. Its totient is φ = 810936.

The previous prime is 1216421. The next prime is 1216433. The reversal of 1216431 is 1346121.

It is a happy number.

1216431 is a `hidden beast` number, since 1 + 21 + 643 + 1 = 666.

It is not a de Polignac number, because 1216431 - 2⁹ = 1215919 is a prime.

It is a super-2 number, since 2×1216431² = 2959408755522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22500 + ... + 22553.

It is an arithmetic number, because the mean of its divisors is an integer number (225270).

2^1216431 is an apocalyptic number.

1216431 is a deficient number, since it is larger than the sum of its proper divisors (585729).

1216431 is an equidigital number, since it uses as much as digits as its factorization.

1216431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45062 (or 45056 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1216431 is about 1102.9193080185. The cubic root of 1216431 is about 106.7486749978.

The spelling of 1216431 in words is "one million, two hundred sixteen thousand, four hundred thirty-one".