133640537 has 2 divisors, whose sum is σ = 133640538. Its totient is φ = 133640536.

The previous prime is 133640503. The next prime is 133640609. The reversal of 133640537 is 735046331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127667401 + 5973136 = 11299^2 + 2444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133640537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133640137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66820268 + 66820269.

It is an arithmetic number, because the mean of its divisors is an integer number (66820269).

Almost surely, 2^133640537 is an apocalyptic number.

It is an amenable number.

133640537 is a deficient number, since it is larger than the sum of its proper divisors (1).

133640537 is an equidigital number, since it uses as much as digits as its factorization.

133640537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 133640537 is about 11560.3000393588. The cubic root of 133640537 is about 511.2650090942.

Adding to 133640537 its reverse (735046331), we get a palindrome (868686868).

The spelling of 133640537 in words is "one hundred thirty-three million, six hundred forty thousand, five hundred thirty-seven".