36121681 has 2 divisors, whose sum is σ = 36121682. Its totient is φ = 36121680.

The previous prime is 36121669. The next prime is 36121703. The reversal of 36121681 is 18612163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29257281 + 6864400 = 5409^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 36121681 - 2⁵ = 36121649 is a prime.

It is a super-2 number, since 2×36121681² = 2609551676531522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (36121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18060840 + 18060841.

It is an arithmetic number, because the mean of its divisors is an integer number (18060841).

Almost surely, 2^36121681 is an apocalyptic number.

It is an amenable number.

36121681 is a deficient number, since it is larger than the sum of its proper divisors (1).

36121681 is an equidigital number, since it uses as much as digits as its factorization.

36121681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 36121681 is about 6010.1315293428. The cubic root of 36121681 is about 330.5643267226.

The spelling of 36121681 in words is "thirty-six million, one hundred twenty-one thousand, six hundred eighty-one".