36513221 has 4 divisors (see below), whose sum is σ = 36658944. Its totient is φ = 36367500.

The previous prime is 36513199. The next prime is 36513223. The reversal of 36513221 is 12231563.

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 36513221 - 2⁶ = 36513157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36513223) 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, 72485 + ... + 72986.

It is an arithmetic number, because the mean of its divisors is an integer number (9164736).

Almost surely, 2^36513221 is an apocalyptic number.

It is an amenable number.

36513221 is a deficient number, since it is larger than the sum of its proper divisors (145723).

36513221 is a wasteful number, since it uses less digits than its factorization.

36513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145722.

The product of its digits is 1080, while the sum is 23.

The square root of 36513221 is about 6042.6170654775. The cubic root of 36513221 is about 331.7544181110.

Adding to 36513221 its reverse (12231563), we get a palindrome (48744784).

The spelling of 36513221 in words is "thirty-six million, five hundred thirteen thousand, two hundred twenty-one".