1181216 has 12 divisors (see below), whose sum is σ = 2325582. Its totient is φ = 590592.

The previous prime is 1181209. The next prime is 1181237. The reversal of 1181216 is 6121811.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 547600 = 796^2 + 740^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18425 + ... + 18488.

2^1181216 is an apocalyptic number.

1181216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1181216 is a deficient number, since it is larger than the sum of its proper divisors (1144366).

1181216 is an equidigital number, since it uses as much as digits as its factorization.

1181216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36923 (or 36915 counting only the distinct ones).

The product of its digits is 96, while the sum is 20.

The square root of 1181216 is about 1086.8376143656. The cubic root of 1181216 is about 105.7084667568.

The spelling of 1181216 in words is "one million, one hundred eighty-one thousand, two hundred sixteen".