17420681 has 2 divisors, whose sum is σ = 17420682. Its totient is φ = 17420680.

The previous prime is 17420653. The next prime is 17420687. The reversal of 17420681 is 18602471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 5107600 = 3509^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 17420681 - 2⁶ = 17420617 is a prime.

It is a super-2 number, since 2×17420681² = 606960253007522, 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 (17420687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8710340 + 8710341.

It is an arithmetic number, because the mean of its divisors is an integer number (8710341).

Almost surely, 2^17420681 is an apocalyptic number.

It is an amenable number.

17420681 is a deficient number, since it is larger than the sum of its proper divisors (1).

17420681 is an equidigital number, since it uses as much as digits as its factorization.

17420681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 17420681 is about 4173.8089318990. The cubic root of 17420681 is about 259.2318600732.

The spelling of 17420681 in words is "seventeen million, four hundred twenty thousand, six hundred eighty-one".