133733813 has 2 divisors, whose sum is σ = 133733814. Its totient is φ = 133733812.

The previous prime is 133733779. The next prime is 133733857. The reversal of 133733813 is 318337331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84971524 + 48762289 = 9218^2 + 6983^2 .

It is a cyclic number.

It is not a de Polignac number, because 133733813 - 2⁶ = 133733749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133733813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133739813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66866906 + 66866907.

It is an arithmetic number, because the mean of its divisors is an integer number (66866907).

Almost surely, 2^133733813 is an apocalyptic number.

It is an amenable number.

133733813 is a deficient number, since it is larger than the sum of its proper divisors (1).

133733813 is an equidigital number, since it uses as much as digits as its factorization.

133733813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 133733813 is about 11564.3336600083. Note that the first 3 decimals coincide. The cubic root of 133733813 is about 511.3839292597.

The spelling of 133733813 in words is "one hundred thirty-three million, seven hundred thirty-three thousand, eight hundred thirteen".