1543113521 has 2 divisors, whose sum is σ = 1543113522. Its totient is φ = 1543113520.

The previous prime is 1543113499. The next prime is 1543113529. The reversal of 1543113521 is 1253113451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1231237921 + 311875600 = 35089^2 + 17660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543113521 - 2²⁶ = 1476004657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1543113529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771556760 + 771556761.

It is an arithmetic number, because the mean of its divisors is an integer number (771556761).

Almost surely, 2^1543113521 is an apocalyptic number.

It is an amenable number.

1543113521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543113521 is an equidigital number, since it uses as much as digits as its factorization.

1543113521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1543113521 is about 39282.4836409309. The cubic root of 1543113521 is about 1155.5780721043.

Adding to 1543113521 its reverse (1253113451), we get a palindrome (2796226972).

The spelling of 1543113521 in words is "one billion, five hundred forty-three million, one hundred thirteen thousand, five hundred twenty-one".