1216851 has 8 divisors (see below), whose sum is σ = 1627584. Its totient is φ = 808680.

The previous prime is 1216849. The next prime is 1216867. The reversal of 1216851 is 1586121.

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

It is not a de Polignac number, because 1216851 - 2¹ = 1216849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216841) 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, 1416 + ... + 2106.

It is an arithmetic number, because the mean of its divisors is an integer number (203448).

2^1216851 is an apocalyptic number.

1216851 is a deficient number, since it is larger than the sum of its proper divisors (410733).

1216851 is an equidigital number, since it uses as much as digits as its factorization.

1216851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281.

The product of its digits is 480, while the sum is 24.

The square root of 1216851 is about 1103.1096953613. The cubic root of 1216851 is about 106.7609593730.

The spelling of 1216851 in words is "one million, two hundred sixteen thousand, eight hundred fifty-one".