42043531 has 2 divisors, whose sum is σ = 42043532. Its totient is φ = 42043530.

The previous prime is 42043513. The next prime is 42043549. The reversal of 42043531 is 13534024.

Together with previous prime (42043513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (42043513) and next prime (42043549).

It is a cyclic number.

It is not a de Polignac number, because 42043531 - 2⁹ = 42043019 is a prime.

It is a super-2 number, since 2×42043531² = 3535316997895922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42044531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021765 + 21021766.

It is an arithmetic number, because the mean of its divisors is an integer number (21021766).

Almost surely, 2^42043531 is an apocalyptic number.

42043531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043531 is an equidigital number, since it uses as much as digits as its factorization.

42043531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 42043531 is about 6484.0983181935. The cubic root of 42043531 is about 347.7227142260.

Adding to 42043531 its reverse (13534024), we get a palindrome (55577555).

The spelling of 42043531 in words is "forty-two million, forty-three thousand, five hundred thirty-one".