42056513 has 2 divisors, whose sum is σ = 42056514. Its totient is φ = 42056512.

The previous prime is 42056477. The next prime is 42056527. The reversal of 42056513 is 31565024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40538689 + 1517824 = 6367^2 + 1232^2 .

It is a cyclic number.

It is not a de Polignac number, because 42056513 - 2⁶ = 42056449 is a prime.

It is not a weakly prime, because it can be changed into another prime (42056533) 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, 21028256 + 21028257.

It is an arithmetic number, because the mean of its divisors is an integer number (21028257).

Almost surely, 2^42056513 is an apocalyptic number.

It is an amenable number.

42056513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42056513 is an equidigital number, since it uses as much as digits as its factorization.

42056513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 42056513 is about 6485.0993053306. The cubic root of 42056513 is about 347.7584999274.

The spelling of 42056513 in words is "forty-two million, fifty-six thousand, five hundred thirteen".