133947911 has 4 divisors (see below), whose sum is σ = 134144712. Its totient is φ = 133751112.

The previous prime is 133947901. The next prime is 133947953. The reversal of 133947911 is 119749331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119749331 = 13 ⋅9211487.

It is a cyclic number.

It is not a de Polignac number, because 133947911 - 2¹⁰ = 133946887 is a prime.

It is a super-2 number, since 2×133947911² = 35884085722527842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133947901) 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 in 3 ways as a sum of consecutive naturals, for example, 97376 + ... + 98741.

It is an arithmetic number, because the mean of its divisors is an integer number (33536178).

Almost surely, 2^133947911 is an apocalyptic number.

133947911 is a deficient number, since it is larger than the sum of its proper divisors (196801).

133947911 is an equidigital number, since it uses as much as digits as its factorization.

133947911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196800.

The product of its digits is 20412, while the sum is 38.

The square root of 133947911 is about 11573.5867819790. The cubic root of 133947911 is about 511.6566797816.

The spelling of 133947911 in words is "one hundred thirty-three million, nine hundred forty-seven thousand, nine hundred eleven".