1216331 has 4 divisors (see below), whose sum is σ = 1227600. Its totient is φ = 1205064.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216331 is 1336121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216331 is a prime.

It is a super-2 number, since 2×1216331² = 2958922203122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216337) 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, 5471 + ... + 5688.

It is an arithmetic number, because the mean of its divisors is an integer number (306900).

2^1216331 is an apocalyptic number.

1216331 is a deficient number, since it is larger than the sum of its proper divisors (11269).

1216331 is a wasteful number, since it uses less digits than its factorization.

1216331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11268.

The product of its digits is 108, while the sum is 17.

The square root of 1216331 is about 1102.8739728546. The cubic root of 1216331 is about 106.7457497298.

The spelling of 1216331 in words is "one million, two hundred sixteen thousand, three hundred thirty-one".