36511681 has 2 divisors, whose sum is σ = 36511682. Its totient is φ = 36511680.

The previous prime is 36511669. The next prime is 36511697. The reversal of 36511681 is 18611563.

36511681 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., 27457600 + 9054081 = 5240^2 + 3009^2 .

It is a cyclic number.

It is not a de Polignac number, because 36511681 - 2¹⁵ = 36478913 is a prime.

It is a super-2 number, since 2×36511681² = 2666205698891522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (36511081) 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, 18255840 + 18255841.

It is an arithmetic number, because the mean of its divisors is an integer number (18255841).

Almost surely, 2^36511681 is an apocalyptic number.

It is an amenable number.

36511681 is a deficient number, since it is larger than the sum of its proper divisors (1).

36511681 is an equidigital number, since it uses as much as digits as its factorization.

36511681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 36511681 is about 6042.4896359034. The cubic root of 36511681 is about 331.7497539649.

The spelling of 36511681 in words is "thirty-six million, five hundred eleven thousand, six hundred eighty-one".