133621603 has 2 divisors, whose sum is σ = 133621604. Its totient is φ = 133621602.

The previous prime is 133621577. The next prime is 133621613. The reversal of 133621603 is 306126331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133621603 - 2⁵ = 133621571 is a prime.

It is not a weakly prime, because it can be changed into another prime (133621613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66810801 + 66810802.

It is an arithmetic number, because the mean of its divisors is an integer number (66810802).

Almost surely, 2^133621603 is an apocalyptic number.

133621603 is a deficient number, since it is larger than the sum of its proper divisors (1).

133621603 is an equidigital number, since it uses as much as digits as its factorization.

133621603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 133621603 is about 11559.4810869693. The cubic root of 133621603 is about 511.2408628556.

Adding to 133621603 its reverse (306126331), we get a palindrome (439747934).

The spelling of 133621603 in words is "one hundred thirty-three million, six hundred twenty-one thousand, six hundred three".