1216484309 has 8 divisors (see below), whose sum is σ = 1246793688. Its totient is φ = 1186205440.

The previous prime is 1216484303. The next prime is 1216484341. The reversal of 1216484309 is 9034846121.

It can be written as a sum of positive squares in 4 ways, for example, as 17247409 + 1199236900 = 4153^2 + 34630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216484309 - 2⁴ = 1216484293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216484303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87719 + ... + 100635.

It is an arithmetic number, because the mean of its divisors is an integer number (155849211).

Almost surely, 2^1216484309 is an apocalyptic number.

It is an amenable number.

1216484309 is a deficient number, since it is larger than the sum of its proper divisors (30309379).

1216484309 is a wasteful number, since it uses less digits than its factorization.

1216484309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15255.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1216484309 is about 34878.1351135636. The cubic root of 1216484309 is about 1067.5023436337.

The spelling of 1216484309 in words is "one billion, two hundred sixteen million, four hundred eighty-four thousand, three hundred nine".