42426661 has 2 divisors, whose sum is σ = 42426662. Its totient is φ = 42426660.

The previous prime is 42426647. The next prime is 42426667. The reversal of 42426661 is 16662424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 630436 = 6465^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 42426661 - 2⁷ = 42426533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42426667) 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, 21213330 + 21213331.

It is an arithmetic number, because the mean of its divisors is an integer number (21213331).

Almost surely, 2^42426661 is an apocalyptic number.

It is an amenable number.

42426661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42426661 is an equidigital number, since it uses as much as digits as its factorization.

42426661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 31.

The square root of 42426661 is about 6513.5751319840. The cubic root of 42426661 is about 348.7757526921.

The spelling of 42426661 in words is "forty-two million, four hundred twenty-six thousand, six hundred sixty-one".