135649237 has 2 divisors, whose sum is σ = 135649238. Its totient is φ = 135649236.

The previous prime is 135649231. The next prime is 135649253. The reversal of 135649237 is 732946531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 3721041 = 11486^2 + 1929^2 .

It is an emirp because it is prime and its reverse (732946531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135649237 - 2³ = 135649229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135649237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135649231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67824618 + 67824619.

It is an arithmetic number, because the mean of its divisors is an integer number (67824619).

Almost surely, 2^135649237 is an apocalyptic number.

It is an amenable number.

135649237 is a deficient number, since it is larger than the sum of its proper divisors (1).

135649237 is an equidigital number, since it uses as much as digits as its factorization.

135649237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The square root of 135649237 is about 11646.8552407935. The cubic root of 135649237 is about 513.8138245327.

It can be divided in two parts, 13564 and 9237, that added together give a square (22801 = 151²).

The spelling of 135649237 in words is "one hundred thirty-five million, six hundred forty-nine thousand, two hundred thirty-seven".