133748561 has 2 divisors, whose sum is σ = 133748562. Its totient is φ = 133748560.

The previous prime is 133748507. The next prime is 133748567. The reversal of 133748561 is 165847331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129254161 + 4494400 = 11369^2 + 2120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133748561 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (133748567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66874280 + 66874281.

It is an arithmetic number, because the mean of its divisors is an integer number (66874281).

Almost surely, 2^133748561 is an apocalyptic number.

It is an amenable number.

133748561 is a deficient number, since it is larger than the sum of its proper divisors (1).

133748561 is an equidigital number, since it uses as much as digits as its factorization.

133748561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 133748561 is about 11564.9712926578. The cubic root of 133748561 is about 511.4027268317.

The spelling of 133748561 in words is "one hundred thirty-three million, seven hundred forty-eight thousand, five hundred sixty-one".