133120261 has 2 divisors, whose sum is σ = 133120262. Its totient is φ = 133120260.

The previous prime is 133120201. The next prime is 133120279. The reversal of 133120261 is 162021331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126900225 + 6220036 = 11265^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 133120261 - 2⁷ = 133120133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133120201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66560130 + 66560131.

It is an arithmetic number, because the mean of its divisors is an integer number (66560131).

Almost surely, 2^133120261 is an apocalyptic number.

It is an amenable number.

133120261 is a deficient number, since it is larger than the sum of its proper divisors (1).

133120261 is an equidigital number, since it uses as much as digits as its factorization.

133120261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 133120261 is about 11537.7753921629. The cubic root of 133120261 is about 510.6006776092.

Adding to 133120261 its reverse (162021331), we get a palindrome (295141592).

The spelling of 133120261 in words is "one hundred thirty-three million, one hundred twenty thousand, two hundred sixty-one".