1211208144 has 40 divisors (see below), whose sum is σ = 3153607680. Its totient is φ = 400555008.

The previous prime is 1211208139. The next prime is 1211208149. The reversal of 1211208144 is 4418021121.

It is an interprime number because it is at equal distance from previous prime (1211208139) and next prime (1211208149).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211208149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93249 + ... + 105440.

It is an arithmetic number, because the mean of its divisors is an integer number (78840192).

Almost surely, 2^1211208144 is an apocalyptic number.

It is an amenable number.

1211208144 is an abundant number, since it is smaller than the sum of its proper divisors (1942399536).

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

1211208144 is a wasteful number, since it uses less digits than its factorization.

1211208144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198827 (or 198821 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1211208144 is about 34802.4157782186. The cubic root of 1211208144 is about 1065.9567747035.

Adding to 1211208144 its reverse (4418021121), we get a palindrome (5629229265).

The spelling of 1211208144 in words is "one billion, two hundred eleven million, two hundred eight thousand, one hundred forty-four".