1143521581 has 2 divisors, whose sum is σ = 1143521582. Its totient is φ = 1143521580.

The previous prime is 1143521569. The next prime is 1143521647. The reversal of 1143521581 is 1851253411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 932080900 + 211440681 = 30530^2 + 14541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143521581 - 2¹³ = 1143513389 is a prime.

It is a super-2 number, since 2×1143521581² = 2615283212425479122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143521501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571760790 + 571760791.

It is an arithmetic number, because the mean of its divisors is an integer number (571760791).

Almost surely, 2^1143521581 is an apocalyptic number.

It is an amenable number.

1143521581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143521581 is an equidigital number, since it uses as much as digits as its factorization.

1143521581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 31.

The square root of 1143521581 is about 33815.9959338772. The cubic root of 1143521581 is about 1045.7184930872.

Adding to 1143521581 its reverse (1851253411), we get a palindrome (2994774992).

The spelling of 1143521581 in words is "one billion, one hundred forty-three million, five hundred twenty-one thousand, five hundred eighty-one".