1211549144 has 16 divisors (see below), whose sum is σ = 2446397520. Its totient is φ = 559176480.

The previous prime is 1211549113. The next prime is 1211549147. The reversal of 1211549144 is 4419451121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211549144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211549147) 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, 5824652 + ... + 5824859.

It is an arithmetic number, because the mean of its divisors is an integer number (152899845).

Almost surely, 2^1211549144 is an apocalyptic number.

It is an amenable number.

1211549144 is an abundant number, since it is smaller than the sum of its proper divisors (1234848376).

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

1211549144 is a wasteful number, since it uses less digits than its factorization.

1211549144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11649530 (or 11649526 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 1211549144 is about 34807.3145186468. The cubic root of 1211549144 is about 1066.0568007684.

The spelling of 1211549144 in words is "one billion, two hundred eleven million, five hundred forty-nine thousand, one hundred forty-four".