1153435561 has 2 divisors, whose sum is σ = 1153435562. Its totient is φ = 1153435560.

The previous prime is 1153435559. The next prime is 1153435571. The reversal of 1153435561 is 1655343511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945931536 + 207504025 = 30756^2 + 14405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153435561 - 2¹ = 1153435559 is a prime.

Together with 1153435559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1153435501) 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, 576717780 + 576717781.

It is an arithmetic number, because the mean of its divisors is an integer number (576717781).

Almost surely, 2^1153435561 is an apocalyptic number.

It is an amenable number.

1153435561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153435561 is an equidigital number, since it uses as much as digits as its factorization.

1153435561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 1153435561 is about 33962.2667235272. The cubic root of 1153435561 is about 1048.7318206989.

The spelling of 1153435561 in words is "one billion, one hundred fifty-three million, four hundred thirty-five thousand, five hundred sixty-one".