133345561 has 2 divisors, whose sum is σ = 133345562. Its totient is φ = 133345560.

The previous prime is 133345549. The next prime is 133345577. The reversal of 133345561 is 165543331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112360000 + 20985561 = 10600^2 + 4581^2 .

It is a cyclic number.

It is not a de Polignac number, because 133345561 - 2⁹ = 133345049 is a prime.

It is not a weakly prime, because it can be changed into another prime (133345361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66672780 + 66672781.

It is an arithmetic number, because the mean of its divisors is an integer number (66672781).

Almost surely, 2^133345561 is an apocalyptic number.

It is an amenable number.

133345561 is a deficient number, since it is larger than the sum of its proper divisors (1).

133345561 is an equidigital number, since it uses as much as digits as its factorization.

133345561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 31.

The square root of 133345561 is about 11547.5348451520. The cubic root of 133345561 is about 510.8885714122. Note that the first 3 decimals are identical.

Adding to 133345561 its reverse (165543331), we get a palindrome (298888892).

The spelling of 133345561 in words is "one hundred thirty-three million, three hundred forty-five thousand, five hundred sixty-one".