133345813 has 2 divisors, whose sum is σ = 133345814. Its totient is φ = 133345812.

The previous prime is 133345801. The next prime is 133345831. The reversal of 133345813 is 318543331.

Together with next prime (133345831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123498769 + 9847044 = 11113^2 + 3138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133345813 is a prime.

It is a super-2 number, since 2×133345813² = 35562211689261938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133345843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66672906 + 66672907.

It is an arithmetic number, because the mean of its divisors is an integer number (66672907).

Almost surely, 2^133345813 is an apocalyptic number.

It is an amenable number.

133345813 is a deficient number, since it is larger than the sum of its proper divisors (1).

133345813 is an equidigital number, since it uses as much as digits as its factorization.

133345813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 133345813 is about 11547.5457565666. The cubic root of 133345813 is about 510.8888932422. Note that the first 4 decimals are identical.

The spelling of 133345813 in words is "one hundred thirty-three million, three hundred forty-five thousand, eight hundred thirteen".