35720681 has 2 divisors, whose sum is σ = 35720682. Its totient is φ = 35720680.

The previous prime is 35720623. The next prime is 35720683. The reversal of 35720681 is 18602753.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30151081 + 5569600 = 5491^2 + 2360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-35720681 is a prime.

It is a super-2 number, since 2×35720681² = 2551934102207522, which contains 22 as substring.

Together with 35720683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (35720683) 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, 17860340 + 17860341.

It is an arithmetic number, because the mean of its divisors is an integer number (17860341).

Almost surely, 2^35720681 is an apocalyptic number.

It is an amenable number.

35720681 is a deficient number, since it is larger than the sum of its proper divisors (1).

35720681 is an equidigital number, since it uses as much as digits as its factorization.

35720681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 35720681 is about 5976.6780907123. The cubic root of 35720681 is about 329.3365335359.

The spelling of 35720681 in words is "thirty-five million, seven hundred twenty thousand, six hundred eighty-one".