1143211264 has 72 divisors (see below), whose sum is σ = 2468559240. Its totient is φ = 525262848.

The previous prime is 1143211261. The next prime is 1143211283. The reversal of 1143211264 is 4621123411.

It can be written as a sum of positive squares in 4 ways, for example, as 230400 + 1142980864 = 480^2 + 33808^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143211261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894594 + ... + 895870.

It is an arithmetic number, because the mean of its divisors is an integer number (34285545).

Almost surely, 2^1143211264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143211264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234279620).

1143211264 is an abundant number, since it is smaller than the sum of its proper divisors (1325347976).

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

1143211264 is a wasteful number, since it uses less digits than its factorization.

1143211264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575 (or 1561 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 1143211264 is about 33811.4073058191. The cubic root of 1143211264 is about 1045.6238924579.

Adding to 1143211264 its reverse (4621123411), we get a palindrome (5764334675).

The spelling of 1143211264 in words is "one billion, one hundred forty-three million, two hundred eleven thousand, two hundred sixty-four".