133531637 has 2 divisors, whose sum is σ = 133531638. Its totient is φ = 133531636.

The previous prime is 133531633. The next prime is 133531661. The reversal of 133531637 is 736135331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99880036 + 33651601 = 9994^2 + 5801^2 .

It is a cyclic number.

It is not a de Polignac number, because 133531637 - 2² = 133531633 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133531633) 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, 66765818 + 66765819.

It is an arithmetic number, because the mean of its divisors is an integer number (66765819).

Almost surely, 2^133531637 is an apocalyptic number.

It is an amenable number.

133531637 is a deficient number, since it is larger than the sum of its proper divisors (1).

133531637 is an equidigital number, since it uses as much as digits as its factorization.

133531637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 32.

The square root of 133531637 is about 11555.5889940756. The cubic root of 133531637 is about 511.1260994222.

Adding to 133531637 its reverse (736135331), we get a palindrome (869666968).

The spelling of 133531637 in words is "one hundred thirty-three million, five hundred thirty-one thousand, six hundred thirty-seven".