133128389 has 2 divisors, whose sum is σ = 133128390. Its totient is φ = 133128388.

The previous prime is 133128319. The next prime is 133128419. The reversal of 133128389 is 983821331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132940900 + 187489 = 11530^2 + 433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133128389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133128319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66564194 + 66564195.

It is an arithmetic number, because the mean of its divisors is an integer number (66564195).

Almost surely, 2^133128389 is an apocalyptic number.

It is an amenable number.

133128389 is a deficient number, since it is larger than the sum of its proper divisors (1).

133128389 is an equidigital number, since it uses as much as digits as its factorization.

133128389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 133128389 is about 11538.1276210657. The cubic root of 133128389 is about 510.6110694104.

The spelling of 133128389 in words is "one hundred thirty-three million, one hundred twenty-eight thousand, three hundred eighty-nine".