42086831 has 2 divisors, whose sum is σ = 42086832. Its totient is φ = 42086830.

The previous prime is 42086827. The next prime is 42086867. The reversal of 42086831 is 13868024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42086831 - 2² = 42086827 is a prime.

It is a super-2 number, since 2×42086831² = 3542602687245122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42086431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21043415 + 21043416.

It is an arithmetic number, because the mean of its divisors is an integer number (21043416).

Almost surely, 2^42086831 is an apocalyptic number.

42086831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42086831 is an equidigital number, since it uses as much as digits as its factorization.

42086831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 42086831 is about 6487.4363966054. The cubic root of 42086831 is about 347.8420447337.

The spelling of 42086831 in words is "forty-two million, eighty-six thousand, eight hundred thirty-one".