1143521313521 has 2 divisors, whose sum is σ = 1143521313522. Its totient is φ = 1143521313520.

The previous prime is 1143521313461. The next prime is 1143521313581. The reversal of 1143521313521 is 1253131253411.

It is a balanced prime because it is at equal distance from previous prime (1143521313461) and next prime (1143521313581).

It can be written as a sum of positive squares in only one way, i.e., 1084295277025 + 59226036496 = 1041295^2 + 243364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143521313521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143521313581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571760656760 + 571760656761.

It is an arithmetic number, because the mean of its divisors is an integer number (571760656761).

Almost surely, 2^{1143521313521} is an apocalyptic number.

It is an amenable number.

1143521313521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143521313521 is an equidigital number, since it uses as much as digits as its factorization.

1143521313521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

Adding to 1143521313521 its reverse (1253131253411), we get a palindrome (2396652566932).

The spelling of 1143521313521 in words is "one trillion, one hundred forty-three billion, five hundred twenty-one million, three hundred thirteen thousand, five hundred twenty-one".