36719681 has 2 divisors, whose sum is σ = 36719682. Its totient is φ = 36719680.

The previous prime is 36719671. The next prime is 36719719. The reversal of 36719681 is 18691763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35509681 + 1210000 = 5959^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 36719681 - 2²² = 32525377 is a prime.

It is a super-2 number, since 2×36719681² = 2696669945483522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (36719671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18359840 + 18359841.

It is an arithmetic number, because the mean of its divisors is an integer number (18359841).

Almost surely, 2^36719681 is an apocalyptic number.

It is an amenable number.

36719681 is a deficient number, since it is larger than the sum of its proper divisors (1).

36719681 is an equidigital number, since it uses as much as digits as its factorization.

36719681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 36719681 is about 6059.6766415379. The cubic root of 36719681 is about 332.3785329019.

The spelling of 36719681 in words is "thirty-six million, seven hundred nineteen thousand, six hundred eighty-one".