42865531 has 2 divisors, whose sum is σ = 42865532. Its totient is φ = 42865530.

The previous prime is 42865513. The next prime is 42865549. The reversal of 42865531 is 13556824.

Together with previous prime (42865513) 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 (42865513) and next prime (42865549).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42865531 is a prime.

It is a super-2 number, since 2×42865531² = 3674907495823922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42865331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432765 + 21432766.

It is an arithmetic number, because the mean of its divisors is an integer number (21432766).

Almost surely, 2^42865531 is an apocalyptic number.

42865531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42865531 is an equidigital number, since it uses as much as digits as its factorization.

42865531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 42865531 is about 6547.1773307281. The cubic root of 42865531 is about 349.9742321166.

The spelling of 42865531 in words is "forty-two million, eight hundred sixty-five thousand, five hundred thirty-one".