133668137 has 4 divisors (see below), whose sum is σ = 134001876. Its totient is φ = 133334400.

The previous prime is 133668113. The next prime is 133668167. The reversal of 133668137 is 731866331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101223721 + 32444416 = 10061^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 133668137 - 2¹⁴ = 133651753 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 133668137.

It is not an unprimeable number, because it can be changed into a prime (133668167) 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, 166268 + ... + 167069.

It is an arithmetic number, because the mean of its divisors is an integer number (33500469).

Almost surely, 2^133668137 is an apocalyptic number.

It is an amenable number.

133668137 is a deficient number, since it is larger than the sum of its proper divisors (333739).

133668137 is an equidigital number, since it uses as much as digits as its factorization.

133668137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333738.

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

The square root of 133668137 is about 11561.4937183739. The cubic root of 133668137 is about 511.3002028642.

The spelling of 133668137 in words is "one hundred thirty-three million, six hundred sixty-eight thousand, one hundred thirty-seven".