135781537 has 2 divisors, whose sum is σ = 135781538. Its totient is φ = 135781536.

The previous prime is 135781531. The next prime is 135781549. The reversal of 135781537 is 735187531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103245921 + 32535616 = 10161^2 + 5704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135781537 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135781537.

It is not a weakly prime, because it can be changed into another prime (135781531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67890768 + 67890769.

It is an arithmetic number, because the mean of its divisors is an integer number (67890769).

Almost surely, 2^135781537 is an apocalyptic number.

It is an amenable number.

135781537 is a deficient number, since it is larger than the sum of its proper divisors (1).

135781537 is an equidigital number, since it uses as much as digits as its factorization.

135781537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The square root of 135781537 is about 11652.5335013464. The cubic root of 135781537 is about 513.9808127707.

The spelling of 135781537 in words is "one hundred thirty-five million, seven hundred eighty-one thousand, five hundred thirty-seven".