133687109 has 4 divisors (see below), whose sum is σ = 139499616. Its totient is φ = 127874604.

The previous prime is 133687087. The next prime is 133687111. The reversal of 133687109 is 901786331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133687109 - 2⁸ = 133686853 is a prime.

It is a super-2 number, since 2×133687109² = 35744486225555762, 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 (133687139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906219 + ... + 2906264.

It is an arithmetic number, because the mean of its divisors is an integer number (34874904).

Almost surely, 2^133687109 is an apocalyptic number.

It is an amenable number.

133687109 is a deficient number, since it is larger than the sum of its proper divisors (5812507).

133687109 is an equidigital number, since it uses as much as digits as its factorization.

133687109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812506.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 133687109 is about 11562.3141714797. The cubic root of 133687109 is about 511.3243919461.

The spelling of 133687109 in words is "one hundred thirty-three million, six hundred eighty-seven thousand, one hundred nine".