133805613 has 4 divisors (see below), whose sum is σ = 178407488. Its totient is φ = 89203740.

The previous prime is 133805603. The next prime is 133805621. The reversal of 133805613 is 316508331.

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 not a de Polignac number, because 133805613 - 2⁴ = 133805597 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 (133805603) 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, 22300933 + ... + 22300938.

It is an arithmetic number, because the mean of its divisors is an integer number (44601872).

Almost surely, 2^133805613 is an apocalyptic number.

It is an amenable number.

133805613 is a deficient number, since it is larger than the sum of its proper divisors (44601875).

133805613 is an equidigital number, since it uses as much as digits as its factorization.

133805613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44601874.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 133805613 is about 11567.4376159978. The cubic root of 133805613 is about 511.4754314166.

The spelling of 133805613 in words is "one hundred thirty-three million, eight hundred five thousand, six hundred thirteen".