1213112144 has 20 divisors (see below), whose sum is σ = 2351995296. Its totient is φ = 606145632.

The previous prime is 1213112143. The next prime is 1213112183. The reversal of 1213112144 is 4412113121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213112143) 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, 524 + ... + 49259.

Almost surely, 2^1213112144 is an apocalyptic number.

It is an amenable number.

1213112144 is a deficient number, since it is larger than the sum of its proper divisors (1138883152).

1213112144 is a wasteful number, since it uses less digits than its factorization.

1213112144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51314 (or 51308 counting only the distinct ones).

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

The square root of 1213112144 is about 34829.7594594048. The cubic root of 1213112144 is about 1066.5150379953.

Adding to 1213112144 its reverse (4412113121), we get a palindrome (5625225265).

The spelling of 1213112144 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, one hundred forty-four".