133686137 has 4 divisors (see below), whose sum is σ = 143969700. Its totient is φ = 123402576.

The previous prime is 133686131. The next prime is 133686151. The reversal of 133686137 is 731686331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731686331 = 1163 ⋅629137.

It can be written as a sum of positive squares in 2 ways, for example, as 26584336 + 107101801 = 5156^2 + 10349^2 .

It is a cyclic number.

It is not a de Polignac number, because 133686137 - 2⁶ = 133686073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133686137.

It is not an unprimeable number, because it can be changed into a prime (133686131) 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, 5141762 + ... + 5141787.

It is an arithmetic number, because the mean of its divisors is an integer number (35992425).

Almost surely, 2^133686137 is an apocalyptic number.

It is an amenable number.

133686137 is a deficient number, since it is larger than the sum of its proper divisors (10283563).

133686137 is a wasteful number, since it uses less digits than its factorization.

133686137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283562.

The product of its digits is 54432, while the sum is 38.

The square root of 133686137 is about 11562.2721382953. The cubic root of 133686137 is about 511.3231527129.

The spelling of 133686137 in words is "one hundred thirty-three million, six hundred eighty-six thousand, one hundred thirty-seven".