133685823 has 4 divisors (see below), whose sum is σ = 178247768. Its totient is φ = 89123880.

The previous prime is 133685803. The next prime is 133685861. The reversal of 133685823 is 328586331.

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

It is not a de Polignac number, because 133685823 - 2¹³ = 133677631 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 (133685803) 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, 22280968 + ... + 22280973.

It is an arithmetic number, because the mean of its divisors is an integer number (44561942).

Almost surely, 2^133685823 is an apocalyptic number.

133685823 is a deficient number, since it is larger than the sum of its proper divisors (44561945).

133685823 is an equidigital number, since it uses as much as digits as its factorization.

133685823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44561944.

The product of its digits is 103680, while the sum is 39.

The square root of 133685823 is about 11562.2585596414. The cubic root of 133685823 is about 511.3227523832.

It can be divided in two parts, 13368 and 5823, that added together give a palindrome (19191).

The spelling of 133685823 in words is "one hundred thirty-three million, six hundred eighty-five thousand, eight hundred twenty-three".