1043654135521 has 2 divisors, whose sum is σ = 1043654135522. Its totient is φ = 1043654135520.

The previous prime is 1043654135519. The next prime is 1043654135543. The reversal of 1043654135521 is 1255314563401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523039936225 + 520614199296 = 723215^2 + 721536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1043654135521 - 2¹ = 1043654135519 is a prime.

Together with 1043654135519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1043654135581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521827067760 + 521827067761.

It is an arithmetic number, because the mean of its divisors is an integer number (521827067761).

Almost surely, 2^{1043654135521} is an apocalyptic number.

It is an amenable number.

1043654135521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043654135521 is an equidigital number, since it uses as much as digits as its factorization.

1043654135521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 40.

Adding to 1043654135521 its reverse (1255314563401), we get a palindrome (2298968698922).

The spelling of 1043654135521 in words is "one trillion, forty-three billion, six hundred fifty-four million, one hundred thirty-five thousand, five hundred twenty-one".