36155221 has 4 divisors (see below), whose sum is σ = 36650572. Its totient is φ = 35659872.

The previous prime is 36155201. The next prime is 36155227. The reversal of 36155221 is 12255163.

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 6832996 + 29322225 = 2614^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 36155221 - 2⁹ = 36154709 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 (36155227) 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, 247566 + ... + 247711.

It is an arithmetic number, because the mean of its divisors is an integer number (9162643).

Almost surely, 2^36155221 is an apocalyptic number.

It is an amenable number.

36155221 is a deficient number, since it is larger than the sum of its proper divisors (495351).

36155221 is an equidigital number, since it uses as much as digits as its factorization.

36155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495350.

The product of its digits is 1800, while the sum is 25.

The square root of 36155221 is about 6012.9211702799. The cubic root of 36155221 is about 330.6666078403. Note that the first 4 decimals are identical.

It can be divided in two parts, 3615 and 5221, that added together give a square (8836 = 94²).

The spelling of 36155221 in words is "thirty-six million, one hundred fifty-five thousand, two hundred twenty-one".