133866013 has 4 divisors (see below), whose sum is σ = 135699868. Its totient is φ = 132032160.

The previous prime is 133865989. The next prime is 133866079. The reversal of 133866013 is 310668331.

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 61496964 + 72369049 = 7842^2 + 8507^2 .

It is a cyclic number.

It is not a de Polignac number, because 133866013 - 2⁵ = 133865981 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 (133866613) 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, 916818 + ... + 916963.

It is an arithmetic number, because the mean of its divisors is an integer number (33924967).

Almost surely, 2^133866013 is an apocalyptic number.

It is an amenable number.

133866013 is a deficient number, since it is larger than the sum of its proper divisors (1833855).

133866013 is an equidigital number, since it uses as much as digits as its factorization.

133866013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833854.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 133866013 is about 11570.0480984307. The cubic root of 133866013 is about 511.5523800292.

The spelling of 133866013 in words is "one hundred thirty-three million, eight hundred sixty-six thousand, thirteen".