42281831 has 2 divisors, whose sum is σ = 42281832. Its totient is φ = 42281830.

The previous prime is 42281807. The next prime is 42281851. The reversal of 42281831 is 13818224.

42281831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42281831 is a prime.

It is a super-2 number, since 2×42281831² = 3575506465425122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42281794 and 42281803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42281851) 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, 21140915 + 21140916.

It is an arithmetic number, because the mean of its divisors is an integer number (21140916).

Almost surely, 2^42281831 is an apocalyptic number.

42281831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42281831 is an equidigital number, since it uses as much as digits as its factorization.

42281831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 42281831 is about 6502.4480774551. The cubic root of 42281831 is about 348.3784335022.

The spelling of 42281831 in words is "forty-two million, two hundred eighty-one thousand, eight hundred thirty-one".