135615541 has 2 divisors, whose sum is σ = 135615542. Its totient is φ = 135615540.

The previous prime is 135615497. The next prime is 135615589. The reversal of 135615541 is 145516531.

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., 119814916 + 15800625 = 10946^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 135615541 - 2¹¹ = 135613493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135615241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67807770 + 67807771.

It is an arithmetic number, because the mean of its divisors is an integer number (67807771).

Almost surely, 2^135615541 is an apocalyptic number.

It is an amenable number.

135615541 is a deficient number, since it is larger than the sum of its proper divisors (1).

135615541 is an equidigital number, since it uses as much as digits as its factorization.

135615541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 135615541 is about 11645.4085802088. The cubic root of 135615541 is about 513.7712763037.

The spelling of 135615541 in words is "one hundred thirty-five million, six hundred fifteen thousand, five hundred forty-one".