42017831 has 2 divisors, whose sum is σ = 42017832. Its totient is φ = 42017830.

The previous prime is 42017827. The next prime is 42017867. The reversal of 42017831 is 13871024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42017831 - 2² = 42017827 is a prime.

It is a super-2 number, since 2×42017831² = 3530996243889122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42017831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42017821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21008915 + 21008916.

It is an arithmetic number, because the mean of its divisors is an integer number (21008916).

Almost surely, 2^42017831 is an apocalyptic number.

42017831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42017831 is an equidigital number, since it uses as much as digits as its factorization.

42017831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42017831 is about 6482.1162439438. The cubic root of 42017831 is about 347.6518488235.

Adding to 42017831 its reverse (13871024), we get a palindrome (55888855).

The spelling of 42017831 in words is "forty-two million, seventeen thousand, eight hundred thirty-one".