36318721 has 2 divisors, whose sum is σ = 36318722. Its totient is φ = 36318720.

The previous prime is 36318707. The next prime is 36318761. The reversal of 36318721 is 12781363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 1638400 = 5889^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 36318721 - 2⁷ = 36318593 is a prime.

It is not a weakly prime, because it can be changed into another prime (36318761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18159360 + 18159361.

It is an arithmetic number, because the mean of its divisors is an integer number (18159361).

Almost surely, 2^36318721 is an apocalyptic number.

It is an amenable number.

36318721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36318721 is an equidigital number, since it uses as much as digits as its factorization.

36318721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 36318721 is about 6026.5015556291. The cubic root of 36318721 is about 331.1643017420.

The spelling of 36318721 in words is "thirty-six million, three hundred eighteen thousand, seven hundred twenty-one".