1216184445 has 24 divisors (see below), whose sum is σ = 2409204096. Its totient is φ = 555969888.

The previous prime is 1216184429. The next prime is 1216184447. The reversal of 1216184445 is 5444816121.

It is not a de Polignac number, because 1216184445 - 2⁴ = 1216184429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216184447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1930137 + ... + 1930766.

It is an arithmetic number, because the mean of its divisors is an integer number (100383504).

Almost surely, 2^1216184445 is an apocalyptic number.

1216184445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216184445 is a deficient number, since it is larger than the sum of its proper divisors (1193019651).

1216184445 is a wasteful number, since it uses less digits than its factorization.

1216184445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860921 (or 3860918 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 1216184445 is about 34873.8361096109. The cubic root of 1216184445 is about 1067.4146231357.

The spelling of 1216184445 in words is "one billion, two hundred sixteen million, one hundred eighty-four thousand, four hundred forty-five".