1211055144 has 32 divisors (see below), whose sum is σ = 3260533920. Its totient is φ = 372632256.

The previous prime is 1211055127. The next prime is 1211055149. The reversal of 1211055144 is 4415501121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1211055149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940482 + ... + 1941105.

It is an arithmetic number, because the mean of its divisors is an integer number (101891685).

Almost surely, 2^1211055144 is an apocalyptic number.

It is an amenable number.

1211055144 is an abundant number, since it is smaller than the sum of its proper divisors (2049478776).

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

1211055144 is a wasteful number, since it uses less digits than its factorization.

1211055144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881609 (or 3881605 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 1211055144 is about 34800.2175855267. The cubic root of 1211055144 is about 1065.9118888719.

Adding to 1211055144 its reverse (4415501121), we get a palindrome (5626556265).

The spelling of 1211055144 in words is "one billion, two hundred eleven million, fifty-five thousand, one hundred forty-four".