42661537 has 2 divisors, whose sum is σ = 42661538. Its totient is φ = 42661536.

The previous prime is 42661511. The next prime is 42661589. The reversal of 42661537 is 73516624.

It is a happy number.

42661537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41486481 + 1175056 = 6441^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 42661537 - 2¹⁵ = 42628769 is a prime.

It is not a weakly prime, because it can be changed into another prime (42661337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21330768 + 21330769.

It is an arithmetic number, because the mean of its divisors is an integer number (21330769).

Almost surely, 2^42661537 is an apocalyptic number.

It is an amenable number.

42661537 is a deficient number, since it is larger than the sum of its proper divisors (1).

42661537 is an equidigital number, since it uses as much as digits as its factorization.

42661537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 42661537 is about 6531.5799773102. The cubic root of 42661537 is about 349.4181816564.

The spelling of 42661537 in words is "forty-two million, six hundred sixty-one thousand, five hundred thirty-seven".