1216449903 has 4 divisors (see below), whose sum is σ = 1621933208. Its totient is φ = 810966600.

The previous prime is 1216449847. The next prime is 1216449917. The reversal of 1216449903 is 3099446121.

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

It is not a de Polignac number, because 1216449903 - 2¹⁰ = 1216448879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216449203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202741648 + ... + 202741653.

It is an arithmetic number, because the mean of its divisors is an integer number (405483302).

Almost surely, 2^1216449903 is an apocalyptic number.

1216449903 is a deficient number, since it is larger than the sum of its proper divisors (405483305).

1216449903 is an equidigital number, since it uses as much as digits as its factorization.

1216449903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405483304.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 1216449903 is about 34877.6418784298. The cubic root of 1216449903 is about 1067.4922794316.

The spelling of 1216449903 in words is "one billion, two hundred sixteen million, four hundred forty-nine thousand, nine hundred three".