1216831 has 8 divisors (see below), whose sum is σ = 1517184. Its totient is φ = 948120.

The previous prime is 1216823. The next prime is 1216841. The reversal of 1216831 is 1386121.

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 1216831 - 2³ = 1216823 is a prime.

It is a super-2 number, since 2×1216831² = 2961355365122, which contains 22 as substring.

It is a Duffinian number.

1216831 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216841) 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 7 ways as a sum of consecutive naturals, for example, 7825 + ... + 7978.

It is an arithmetic number, because the mean of its divisors is an integer number (189648).

2^1216831 is an apocalyptic number.

1216831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1216831 is a deficient number, since it is larger than the sum of its proper divisors (300353).

1216831 is a wasteful number, since it uses less digits than its factorization.

1216831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15821.

The product of its digits is 288, while the sum is 22.

The square root of 1216831 is about 1103.1006300424. The cubic root of 1216831 is about 106.7603744668.

The spelling of 1216831 in words is "one million, two hundred sixteen thousand, eight hundred thirty-one".