133633993 has 2 divisors, whose sum is σ = 133633994. Its totient is φ = 133633992.

The previous prime is 133633987. The next prime is 133634057. The reversal of 133633993 is 399336331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127418944 + 6215049 = 11288^2 + 2493^2 .

It is an emirp because it is prime and its reverse (399336331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133633993 - 2⁵ = 133633961 is a prime.

It is not a weakly prime, because it can be changed into another prime (133639993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66816996 + 66816997.

It is an arithmetic number, because the mean of its divisors is an integer number (66816997).

Almost surely, 2^133633993 is an apocalyptic number.

It is an amenable number.

133633993 is a deficient number, since it is larger than the sum of its proper divisors (1).

133633993 is an equidigital number, since it uses as much as digits as its factorization.

133633993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 40.

The square root of 133633993 is about 11560.0169982574. The cubic root of 133633993 is about 511.2566638897.

The spelling of 133633993 in words is "one hundred thirty-three million, six hundred thirty-three thousand, nine hundred ninety-three".