133431289 has 2 divisors, whose sum is σ = 133431290. Its totient is φ = 133431288.

The previous prime is 133431271. The next prime is 133431293. The reversal of 133431289 is 982134331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125619264 + 7812025 = 11208^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 133431289 - 2⁹ = 133430777 is a prime.

It is not a weakly prime, because it can be changed into another prime (133431239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66715644 + 66715645.

It is an arithmetic number, because the mean of its divisors is an integer number (66715645).

Almost surely, 2^133431289 is an apocalyptic number.

It is an amenable number.

133431289 is a deficient number, since it is larger than the sum of its proper divisors (1).

133431289 is an equidigital number, since it uses as much as digits as its factorization.

133431289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 133431289 is about 11551.2462098252. The cubic root of 133431289 is about 510.9980315563.

It can be divided in two parts, 1334 and 31289, that added together give a palindrome (32623).

The spelling of 133431289 in words is "one hundred thirty-three million, four hundred thirty-one thousand, two hundred eighty-nine".