36281521 has 4 divisors (see below), whose sum is σ = 36966132. Its totient is φ = 35596912.

The previous prime is 36281513. The next prime is 36281527. The reversal of 36281521 is 12518263.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10890000 + 25391521 = 3300^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 36281521 - 2³ = 36281513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36281521.

It is not an unprimeable number, because it can be changed into a prime (36281527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342226 + ... + 342331.

It is an arithmetic number, because the mean of its divisors is an integer number (9241533).

Almost surely, 2^36281521 is an apocalyptic number.

It is an amenable number.

36281521 is a deficient number, since it is larger than the sum of its proper divisors (684611).

36281521 is an equidigital number, since it uses as much as digits as its factorization.

36281521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684610.

The product of its digits is 2880, while the sum is 28.

The square root of 36281521 is about 6023.4143971671. The cubic root of 36281521 is about 331.0511964329.

Adding to 36281521 its reverse (12518263), we get a palindrome (48799784).

The spelling of 36281521 in words is "thirty-six million, two hundred eighty-one thousand, five hundred twenty-one".