135215661 has 16 divisors (see below), whose sum is σ = 213148800. Its totient is φ = 74601408.

The previous prime is 135215627. The next prime is 135215677. The reversal of 135215661 is 166512531.

It is not a de Polignac number, because 135215661 - 2²¹ = 133118509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135215621) 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 in 15 ways as a sum of consecutive naturals, for example, 110406 + ... + 111623.

It is an arithmetic number, because the mean of its divisors is an integer number (13321800).

Almost surely, 2^135215661 is an apocalyptic number.

It is an amenable number.

135215661 is a deficient number, since it is larger than the sum of its proper divisors (77933139).

135215661 is a wasteful number, since it uses less digits than its factorization.

135215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222068.

The product of its digits is 5400, while the sum is 30.

The square root of 135215661 is about 11628.2269069708. The cubic root of 135215661 is about 513.2658054292.

The spelling of 135215661 in words is "one hundred thirty-five million, two hundred fifteen thousand, six hundred sixty-one".