133415561 has 2 divisors, whose sum is σ = 133415562. Its totient is φ = 133415560.

The previous prime is 133415551. The next prime is 133415593. The reversal of 133415561 is 165514331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 2175625 = 11456^2 + 1475^2 .

It is an emirp because it is prime and its reverse (165514331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133415561 - 2¹⁰ = 133414537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133415501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66707780 + 66707781.

It is an arithmetic number, because the mean of its divisors is an integer number (66707781).

Almost surely, 2^133415561 is an apocalyptic number.

It is an amenable number.

133415561 is a deficient number, since it is larger than the sum of its proper divisors (1).

133415561 is an equidigital number, since it uses as much as digits as its factorization.

133415561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 133415561 is about 11550.5653974167. The cubic root of 133415561 is about 510.9779530752.

Adding to 133415561 its reverse (165514331), we get a palindrome (298929892).

The spelling of 133415561 in words is "one hundred thirty-three million, four hundred fifteen thousand, five hundred sixty-one".