133638371 has 2 divisors, whose sum is σ = 133638372. Its totient is φ = 133638370.

The previous prime is 133638341. The next prime is 133638397. The reversal of 133638371 is 173836331.

It is a strong prime.

It is an emirp because it is prime and its reverse (173836331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133638371 - 2¹⁸ = 133376227 is a prime.

It is not a weakly prime, because it can be changed into another prime (133638301) 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, 66819185 + 66819186.

It is an arithmetic number, because the mean of its divisors is an integer number (66819186).

Almost surely, 2^133638371 is an apocalyptic number.

133638371 is a deficient number, since it is larger than the sum of its proper divisors (1).

133638371 is an equidigital number, since it uses as much as digits as its factorization.

133638371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 133638371 is about 11560.2063562897. The cubic root of 133638371 is about 511.2622469433.

The spelling of 133638371 in words is "one hundred thirty-three million, six hundred thirty-eight thousand, three hundred seventy-one".