42416681 has 2 divisors, whose sum is σ = 42416682. Its totient is φ = 42416680.

The previous prime is 42416653. The next prime is 42416687. The reversal of 42416681 is 18661424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24098281 + 18318400 = 4909^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 42416681 - 2⁶ = 42416617 is a prime.

It is a super-2 number, since 2×42416681² = 3598349654111522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42416687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21208340 + 21208341.

It is an arithmetic number, because the mean of its divisors is an integer number (21208341).

Almost surely, 2^42416681 is an apocalyptic number.

It is an amenable number.

42416681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42416681 is an equidigital number, since it uses as much as digits as its factorization.

42416681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 42416681 is about 6512.8089945890. The cubic root of 42416681 is about 348.7484031050.

The spelling of 42416681 in words is "forty-two million, four hundred sixteen thousand, six hundred eighty-one".