42420761 has 2 divisors, whose sum is σ = 42420762. Its totient is φ = 42420760.

The previous prime is 42420751. The next prime is 42420769. The reversal of 42420761 is 16702424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26460736 + 15960025 = 5144^2 + 3995^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420761 - 2¹⁰ = 42419737 is a prime.

It is equal to p_2571650 and since 42420761 and 2571650 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42420761.

It is not a weakly prime, because it can be changed into another prime (42420769) 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, 21210380 + 21210381.

It is an arithmetic number, because the mean of its divisors is an integer number (21210381).

Almost surely, 2^42420761 is an apocalyptic number.

It is an amenable number.

42420761 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420761 is an equidigital number, since it uses as much as digits as its factorization.

42420761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 42420761 is about 6513.1222159576. The cubic root of 42420761 is about 348.7595846169.

The spelling of 42420761 in words is "forty-two million, four hundred twenty thousand, seven hundred sixty-one".