135221737 has 16 divisors (see below), whose sum is σ = 156828672. Its totient is φ = 114201360.

The previous prime is 135221719. The next prime is 135221741. The reversal of 135221737 is 737122531.

It is not a de Polignac number, because 135221737 - 2¹⁵ = 135188969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135221699 and 135221708.

It is not an unprimeable number, because it can be changed into a prime (135221707) 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, 152698 + ... + 153580.

It is an arithmetic number, because the mean of its divisors is an integer number (9801792).

Almost surely, 2^135221737 is an apocalyptic number.

It is an amenable number.

135221737 is a deficient number, since it is larger than the sum of its proper divisors (21606935).

135221737 is a wasteful number, since it uses less digits than its factorization.

135221737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188.

The product of its digits is 8820, while the sum is 31.

The square root of 135221737 is about 11628.4881648476. The cubic root of 135221737 is about 513.2734932870.

The spelling of 135221737 in words is "one hundred thirty-five million, two hundred twenty-one thousand, seven hundred thirty-seven".