1211144478 has 8 divisors (see below), whose sum is σ = 2422288968. Its totient is φ = 403714824.

The previous prime is 1211144477. The next prime is 1211144479. The reversal of 1211144478 is 8744411121.

It is an interprime number because it is at equal distance from previous prime (1211144477) and next prime (1211144479).

It is a sphenic number, since it is the product of 3 distinct primes.

1211144478 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211144471) 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, 100928701 + ... + 100928712.

It is an arithmetic number, because the mean of its divisors is an integer number (302786121).

Almost surely, 2^1211144478 is an apocalyptic number.

1211144478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1211144478 is a wasteful number, since it uses less digits than its factorization.

1211144478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201857418.

The product of its digits is 7168, while the sum is 33.

The square root of 1211144478 is about 34801.5010883151. The cubic root of 1211144478 is about 1065.9380973761.

Adding to 1211144478 its reverse (8744411121), we get a palindrome (9955555599).

The spelling of 1211144478 in words is "one billion, two hundred eleven million, one hundred forty-four thousand, four hundred seventy-eight".