135037521 has 6 divisors (see below), whose sum is σ = 195054210. Its totient is φ = 90025008.

The previous prime is 135037499. The next prime is 135037537. The reversal of 135037521 is 125730531.

135037521 is a `hidden beast` number, since 135 + 0 + 3 + 7 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 92852496 + 42185025 = 9636^2 + 6495^2 .

It is not a de Polignac number, because 135037521 - 2¹⁰ = 135036497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135037561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7502076 + ... + 7502093.

It is an arithmetic number, because the mean of its divisors is an integer number (32509035).

Almost surely, 2^135037521 is an apocalyptic number.

It is an amenable number.

135037521 is a deficient number, since it is larger than the sum of its proper divisors (60016689).

135037521 is a wasteful number, since it uses less digits than its factorization.

135037521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15004175 (or 15004172 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 135037521 is about 11620.5645732038. The cubic root of 135037521 is about 513.0403055322.

The spelling of 135037521 in words is "one hundred thirty-five million, thirty-seven thousand, five hundred twenty-one".