1216083245 has 16 divisors (see below), whose sum is σ = 1625747760. Its totient is φ = 867062784.

The previous prime is 1216083241. The next prime is 1216083307. The reversal of 1216083245 is 5423806121.

1216083245 = 24658² + 24659².

It can be written as a sum of positive squares in 8 ways, for example, as 287845156 + 928238089 = 16966^2 + 30467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216083245 - 2² = 1216083241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216083241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320684 + ... + 324453.

It is an arithmetic number, because the mean of its divisors is an integer number (101609235).

Almost surely, 2^1216083245 is an apocalyptic number.

1216083245 is the 24659-th centered square number.

It is an amenable number.

1216083245 is a deficient number, since it is larger than the sum of its proper divisors (409664515).

1216083245 is a wasteful number, since it uses less digits than its factorization.

1216083245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645184.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1216083245 is about 34872.3851349460. The cubic root of 1216083245 is about 1067.3850154127.

Adding to 1216083245 its reverse (5423806121), we get a palindrome (6639889366).

The spelling of 1216083245 in words is "one billion, two hundred sixteen million, eighty-three thousand, two hundred forty-five".