133521737 has 2 divisors, whose sum is σ = 133521738. Its totient is φ = 133521736.

The previous prime is 133521733. The next prime is 133521763. The reversal of 133521737 is 737125331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132043081 + 1478656 = 11491^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 133521737 - 2² = 133521733 is a prime.

It is not a weakly prime, because it can be changed into another prime (133521733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66760868 + 66760869.

It is an arithmetic number, because the mean of its divisors is an integer number (66760869).

Almost surely, 2^133521737 is an apocalyptic number.

It is an amenable number.

133521737 is a deficient number, since it is larger than the sum of its proper divisors (1).

133521737 is an equidigital number, since it uses as much as digits as its factorization.

133521737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 32.

The square root of 133521737 is about 11555.1606219905. The cubic root of 133521737 is about 511.1134675257.

The spelling of 133521737 in words is "one hundred thirty-three million, five hundred twenty-one thousand, seven hundred thirty-seven".