133244561 has 2 divisors, whose sum is σ = 133244562. Its totient is φ = 133244560.

The previous prime is 133244537. The next prime is 133244581. The reversal of 133244561 is 165442331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128686336 + 4558225 = 11344^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 133244561 - 2¹⁴ = 133228177 is a prime.

It is a super-2 number, since 2×133244561² = 35508226072165442, which contains 22 as substring.

It is a Chen prime.

It is equal to p_7551614 and since 133244561 and 7551614 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (133244581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66622280 + 66622281.

It is an arithmetic number, because the mean of its divisors is an integer number (66622281).

Almost surely, 2^133244561 is an apocalyptic number.

It is an amenable number.

133244561 is a deficient number, since it is larger than the sum of its proper divisors (1).

133244561 is an equidigital number, since it uses as much as digits as its factorization.

133244561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 133244561 is about 11543.1607889694. The cubic root of 133244561 is about 510.7595512969.

Adding to 133244561 its reverse (165442331), we get a palindrome (298686892).

The spelling of 133244561 in words is "one hundred thirty-three million, two hundred forty-four thousand, five hundred sixty-one".