1216554 has 16 divisors (see below), whose sum is σ = 2576448. Its totient is φ = 381632.

The previous prime is 1216547. The next prime is 1216559. The reversal of 1216554 is 4556121.

It is not an unprimeable number, because it can be changed into a prime (1216559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5862 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (161028).

2^1216554 is an apocalyptic number.

1216554 is an abundant number, since it is smaller than the sum of its proper divisors (1359894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216554 is a wasteful number, since it uses less digits than its factorization.

1216554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11949.

The product of its digits is 1200, while the sum is 24.

The square root of 1216554 is about 1102.9750677146. The cubic root of 1216554 is about 106.7522728575.

It can be divided in two parts, 1216 and 554, that added together give a triangular number (1770 = T₅₉).

The spelling of 1216554 in words is "one million, two hundred sixteen thousand, five hundred fifty-four".