1211537868 has 24 divisors (see below), whose sum is σ = 2832341568. Its totient is φ = 403071696.

The previous prime is 1211537867. The next prime is 1211537881. The reversal of 1211537868 is 8687351121.

It is not an unprimeable number, because it can be changed into a prime (1211537867) 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, 90246 + ... + 102797.

It is an arithmetic number, because the mean of its divisors is an integer number (118014232).

Almost surely, 2^1211537868 is an apocalyptic number.

It is an amenable number.

1211537868 is an abundant number, since it is smaller than the sum of its proper divisors (1620803700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211537868 is a wasteful number, since it uses less digits than its factorization.

1211537868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193573 (or 193571 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 1211537868 is about 34807.1525408213. The cubic root of 1211537868 is about 1066.0534934617.

Adding to 1211537868 its reverse (8687351121), we get a palindrome (9898888989).

The spelling of 1211537868 in words is "one billion, two hundred eleven million, five hundred thirty-seven thousand, eight hundred sixty-eight".