1144721256 has 32 divisors (see below), whose sum is σ = 3270632640. Its totient is φ = 327063168.

The previous prime is 1144721251. The next prime is 1144721261. The reversal of 1144721256 is 6521274411.

It is an interprime number because it is at equal distance from previous prime (1144721251) and next prime (1144721261).

It is not an unprimeable number, because it can be changed into a prime (1144721251) 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, 3406741 + ... + 3407076.

It is an arithmetic number, because the mean of its divisors is an integer number (102207270).

Almost surely, 2^1144721256 is an apocalyptic number.

It is an amenable number.

1144721256 is an abundant number, since it is smaller than the sum of its proper divisors (2125911384).

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

1144721256 is a wasteful number, since it uses less digits than its factorization.

1144721256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813833 (or 6813829 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 1144721256 is about 33833.7295608982. The cubic root of 1144721256 is about 1046.0840550206.

Adding to 1144721256 its reverse (6521274411), we get a palindrome (7665995667).

The spelling of 1144721256 in words is "one billion, one hundred forty-four million, seven hundred twenty-one thousand, two hundred fifty-six".