133521803 has 2 divisors, whose sum is σ = 133521804. Its totient is φ = 133521802.

The previous prime is 133521767. The next prime is 133521823. The reversal of 133521803 is 308125331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133521803 - 2²⁰ = 132473227 is a prime.

It is not a weakly prime, because it can be changed into another prime (133521823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66760901 + 66760902.

It is an arithmetic number, because the mean of its divisors is an integer number (66760902).

Almost surely, 2^133521803 is an apocalyptic number.

133521803 is a deficient number, since it is larger than the sum of its proper divisors (1).

133521803 is an equidigital number, since it uses as much as digits as its factorization.

133521803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 133521803 is about 11555.1634778570. The cubic root of 133521803 is about 511.1135517404.

The spelling of 133521803 in words is "one hundred thirty-three million, five hundred twenty-one thousand, eight hundred three".