1131212144 has 20 divisors (see below), whose sum is σ = 2193597696. Its totient is φ = 565122432.

The previous prime is 1131212141. The next prime is 1131212153. The reversal of 1131212144 is 4412121311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131212141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10544 + ... + 48719.

Almost surely, 2^1131212144 is an apocalyptic number.

It is an amenable number.

1131212144 is a deficient number, since it is larger than the sum of its proper divisors (1062385552).

1131212144 is a wasteful number, since it uses less digits than its factorization.

1131212144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60464 (or 60458 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 1131212144 is about 33633.4973501121. The cubic root of 1131212144 is about 1041.9527365115.

Adding to 1131212144 its reverse (4412121311), we get a palindrome (5543333455).

The spelling of 1131212144 in words is "one billion, one hundred thirty-one million, two hundred twelve thousand, one hundred forty-four".