42505031 has 2 divisors, whose sum is σ = 42505032. Its totient is φ = 42505030.

The previous prime is 42505013. The next prime is 42505051. The reversal of 42505031 is 13050524.

Together with previous prime (42505013) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (42505051) can be obtained adding 42505031 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42505031 - 2¹⁴ = 42488647 is a prime.

It is a super-2 number, since 2×42505031² = 3613355320621922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 42504994 and 42505012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42505051) 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, 21252515 + 21252516.

It is an arithmetic number, because the mean of its divisors is an integer number (21252516).

Almost surely, 2^42505031 is an apocalyptic number.

42505031 is a deficient number, since it is larger than the sum of its proper divisors (1).

42505031 is an equidigital number, since it uses as much as digits as its factorization.

42505031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 42505031 is about 6519.5882538700. The cubic root of 42505031 is about 348.9903720083.

Adding to 42505031 its reverse (13050524), we get a palindrome (55555555).

The spelling of 42505031 in words is "forty-two million, five hundred five thousand, thirty-one".