42435661 has 2 divisors, whose sum is σ = 42435662. Its totient is φ = 42435660.

The previous prime is 42435641. The next prime is 42435677. The reversal of 42435661 is 16653424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41203561 + 1232100 = 6419^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 42435661 - 2⁵ = 42435629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42435641) 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, 21217830 + 21217831.

It is an arithmetic number, because the mean of its divisors is an integer number (21217831).

Almost surely, 2^42435661 is an apocalyptic number.

It is an amenable number.

42435661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42435661 is an equidigital number, since it uses as much as digits as its factorization.

42435661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 42435661 is about 6514.2659601831. The cubic root of 42435661 is about 348.8004129707.

The spelling of 42435661 in words is "forty-two million, four hundred thirty-five thousand, six hundred sixty-one".