1216955 has 4 divisors (see below), whose sum is σ = 1460352. Its totient is φ = 973560.

The previous prime is 1216951. The next prime is 1216961. The reversal of 1216955 is 5596121.

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

It is not a de Polignac number, because 1216955 - 2² = 1216951 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1216951) 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, 121691 + ... + 121700.

It is an arithmetic number, because the mean of its divisors is an integer number (365088).

2^1216955 is an apocalyptic number.

1216955 is a deficient number, since it is larger than the sum of its proper divisors (243397).

1216955 is an equidigital number, since it uses as much as digits as its factorization.

1216955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243396.

The product of its digits is 2700, while the sum is 29.

The square root of 1216955 is about 1103.1568338183. The cubic root of 1216955 is about 106.7640007816.

The spelling of 1216955 in words is "one million, two hundred sixteen thousand, nine hundred fifty-five".