1144145521 has 8 divisors (see below), whose sum is σ = 1155551400. Its totient is φ = 1132789632.

The previous prime is 1144145459. The next prime is 1144145531. The reversal of 1144145521 is 1255414411.

It can be written as a sum of positive squares in 4 ways, for example, as 265853025 + 878292496 = 16305^2 + 29636^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1144145521 - 2²⁹ = 607274609 is a prime.

It is a super-2 number, since 2×1144145521² = 2618137946448722882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1144145521.

It is not an unprimeable number, because it can be changed into a prime (1144145531) 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, 34371 + ... + 58903.

It is an arithmetic number, because the mean of its divisors is an integer number (144443925).

Almost surely, 2^1144145521 is an apocalyptic number.

It is an amenable number.

1144145521 is a deficient number, since it is larger than the sum of its proper divisors (11405879).

1144145521 is a wasteful number, since it uses less digits than its factorization.

1144145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24995.

The product of its digits is 3200, while the sum is 28.

The square root of 1144145521 is about 33825.2201914489. The cubic root of 1144145521 is about 1045.9086503975.

Adding to 1144145521 its reverse (1255414411), we get a palindrome (2399559932).

The spelling of 1144145521 in words is "one billion, one hundred forty-four million, one hundred forty-five thousand, five hundred twenty-one".