133856917 has 4 divisors (see below), whose sum is σ = 134102176. Its totient is φ = 133611660.

The previous prime is 133856903. The next prime is 133856951. The reversal of 133856917 is 719658331.

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 133856917 - 2¹⁵ = 133824149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133856117) 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, 121809 + ... + 122902.

It is an arithmetic number, because the mean of its divisors is an integer number (33525544).

Almost surely, 2^133856917 is an apocalyptic number.

It is an amenable number.

133856917 is a deficient number, since it is larger than the sum of its proper divisors (245259).

133856917 is an equidigital number, since it uses as much as digits as its factorization.

133856917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245258.

The product of its digits is 136080, while the sum is 43.

The square root of 133856917 is about 11569.6550078211. The cubic root of 133856917 is about 511.5407933545.

It can be divided in two parts, 13385 and 6917, that added together give a palindrome (20302).

The spelling of 133856917 in words is "one hundred thirty-three million, eight hundred fifty-six thousand, nine hundred seventeen".