42242831 has 2 divisors, whose sum is σ = 42242832. Its totient is φ = 42242830.

The previous prime is 42242803. The next prime is 42242869. The reversal of 42242831 is 13824224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42242831 - 2¹⁴ = 42226447 is a prime.

It is a super-2 number, since 2×42242831² = 3568913541789122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42242831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42241831) 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, 21121415 + 21121416.

It is an arithmetic number, because the mean of its divisors is an integer number (21121416).

Almost surely, 2^42242831 is an apocalyptic number.

42242831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42242831 is an equidigital number, since it uses as much as digits as its factorization.

42242831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 26.

The square root of 42242831 is about 6499.4485150665. The cubic root of 42242831 is about 348.2712878866.

The spelling of 42242831 in words is "forty-two million, two hundred forty-two thousand, eight hundred thirty-one".