36431521 has 4 divisors (see below), whose sum is σ = 41636032. Its totient is φ = 31227012.

The previous prime is 36431503. The next prime is 36431581. The reversal of 36431521 is 12513463.

36431521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36431521 - 2⁵ = 36431489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36431501) 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 3 ways as a sum of consecutive naturals, for example, 2602245 + ... + 2602258.

It is an arithmetic number, because the mean of its divisors is an integer number (10409008).

Almost surely, 2^36431521 is an apocalyptic number.

It is an amenable number.

36431521 is a deficient number, since it is larger than the sum of its proper divisors (5204511).

36431521 is an equidigital number, since it uses as much as digits as its factorization.

36431521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204510.

The product of its digits is 2160, while the sum is 25.

The square root of 36431521 is about 6035.8529637492. The cubic root of 36431521 is about 331.5067947742.

Adding to 36431521 its reverse (12513463), we get a palindrome (48944984).

The spelling of 36431521 in words is "thirty-six million, four hundred thirty-one thousand, five hundred twenty-one".