1211243144 has 16 divisors (see below), whose sum is σ = 2276260800. Its totient is φ = 604240272.

The previous prime is 1211243123. The next prime is 1211243213. The reversal of 1211243144 is 4413421121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168932 + ... + 175955.

It is an arithmetic number, because the mean of its divisors is an integer number (142266300).

Almost surely, 2^1211243144 is an apocalyptic number.

It is an amenable number.

1211243144 is a deficient number, since it is larger than the sum of its proper divisors (1065017656).

1211243144 is a wasteful number, since it uses less digits than its factorization.

1211243144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345332 (or 345328 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 1211243144 is about 34802.9186132428. The cubic root of 1211243144 is about 1065.9670421729.

Adding to 1211243144 its reverse (4413421121), we get a palindrome (5624664265).

The spelling of 1211243144 in words is "one billion, two hundred eleven million, two hundred forty-three thousand, one hundred forty-four".