1216241156 has 24 divisors (see below), whose sum is σ = 2296597464. Its totient is φ = 560252160.

The previous prime is 1216241141. The next prime is 1216241177. The reversal of 1216241156 is 6511426121.

It can be written as a sum of positive squares in 4 ways, for example, as 12845056 + 1203396100 = 3584^2 + 34690^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4646 + ... + 49538.

It is an arithmetic number, because the mean of its divisors is an integer number (95691561).

Almost surely, 2^1216241156 is an apocalyptic number.

It is an amenable number.

1216241156 is a deficient number, since it is larger than the sum of its proper divisors (1080356308).

1216241156 is a wasteful number, since it uses less digits than its factorization.

1216241156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45431 (or 45429 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1216241156 is about 34874.6491881997. The cubic root of 1216241156 is about 1067.4312141525.

Adding to 1216241156 its reverse (6511426121), we get a palindrome (7727667277).

The spelling of 1216241156 in words is "one billion, two hundred sixteen million, two hundred forty-one thousand, one hundred fifty-six".