133938971 has 4 divisors (see below), whose sum is σ = 141817752. Its totient is φ = 126060192.

The previous prime is 133938949. The next prime is 133938989. The reversal of 133938971 is 179839331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133938971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133938901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939365 + ... + 3939398.

It is an arithmetic number, because the mean of its divisors is an integer number (35454438).

Almost surely, 2^133938971 is an apocalyptic number.

133938971 is a deficient number, since it is larger than the sum of its proper divisors (7878781).

133938971 is an equidigital number, since it uses as much as digits as its factorization.

133938971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878780.

The product of its digits is 122472, while the sum is 44.

The square root of 133938971 is about 11573.2005512736. The cubic root of 133938971 is about 511.6452964699.

The spelling of 133938971 in words is "one hundred thirty-three million, nine hundred thirty-eight thousand, nine hundred seventy-one".