133788761 has 2 divisors, whose sum is σ = 133788762. Its totient is φ = 133788760.

The previous prime is 133788713. The next prime is 133788763. The reversal of 133788761 is 167887331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100380361 + 33408400 = 10019^2 + 5780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133788761 is a prime.

Together with 133788763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133788763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66894380 + 66894381.

It is an arithmetic number, because the mean of its divisors is an integer number (66894381).

Almost surely, 2^133788761 is an apocalyptic number.

It is an amenable number.

133788761 is a deficient number, since it is larger than the sum of its proper divisors (1).

133788761 is an equidigital number, since it uses as much as digits as its factorization.

133788761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 133788761 is about 11566.7091689901. The cubic root of 133788761 is about 511.4539581126.

The spelling of 133788761 in words is "one hundred thirty-three million, seven hundred eighty-eight thousand, seven hundred sixty-one".