36615221 has 2 divisors, whose sum is σ = 36615222. Its totient is φ = 36615220.

The previous prime is 36615211. The next prime is 36615253. The reversal of 36615221 is 12251663.

36615221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25150225 + 11464996 = 5015^2 + 3386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36615221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36615211) 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 as a sum of consecutive naturals, namely, 18307610 + 18307611.

It is an arithmetic number, because the mean of its divisors is an integer number (18307611).

Almost surely, 2^36615221 is an apocalyptic number.

It is an amenable number.

36615221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36615221 is an equidigital number, since it uses as much as digits as its factorization.

36615221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 36615221 is about 6051.0512309846. The cubic root of 36615221 is about 332.0630505162.

Adding to 36615221 its reverse (12251663), we get a palindrome (48866884).

The spelling of 36615221 in words is "thirty-six million, six hundred fifteen thousand, two hundred twenty-one".