133717261 has 2 divisors, whose sum is σ = 133717262. Its totient is φ = 133717260.

The previous prime is 133717253. The next prime is 133717271. The reversal of 133717261 is 162717331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125014761 + 8702500 = 11181^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 133717261 - 2³ = 133717253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133717201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66858630 + 66858631.

It is an arithmetic number, because the mean of its divisors is an integer number (66858631).

Almost surely, 2^133717261 is an apocalyptic number.

It is an amenable number.

133717261 is a deficient number, since it is larger than the sum of its proper divisors (1).

133717261 is an equidigital number, since it uses as much as digits as its factorization.

133717261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 31.

The square root of 133717261 is about 11563.6179891935. The cubic root of 133717261 is about 511.3628306912.

The spelling of 133717261 in words is "one hundred thirty-three million, seven hundred seventeen thousand, two hundred sixty-one".