1543515543481 has 2 divisors, whose sum is σ = 1543515543482. Its totient is φ = 1543515543480.

The previous prime is 1543515543469. The next prime is 1543515543497. The reversal of 1543515543481 is 1843455153451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1384905312400 + 158610231081 = 1176820^2 + 398259^2 .

It is an emirp because it is prime and its reverse (1843455153451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1543515543481 is a prime.

It is a super-2 number, since 2×1543515543481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1543215543481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771757771740 + 771757771741.

It is an arithmetic number, because the mean of its divisors is an integer number (771757771741).

Almost surely, 2^{1543515543481} is an apocalyptic number.

It is an amenable number.

1543515543481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543515543481 is an equidigital number, since it uses as much as digits as its factorization.

1543515543481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880000, while the sum is 49.

The spelling of 1543515543481 in words is "one trillion, five hundred forty-three billion, five hundred fifteen million, five hundred forty-three thousand, four hundred eighty-one".