42831587 has 2 divisors, whose sum is σ = 42831588. Its totient is φ = 42831586.

The previous prime is 42831583. The next prime is 42831631. The reversal of 42831587 is 78513824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42831587 - 2² = 42831583 is a prime.

It is a super-3 number, since 3×42831587³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42831587.

It is not a weakly prime, because it can be changed into another prime (42831583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21415793 + 21415794.

It is an arithmetic number, because the mean of its divisors is an integer number (21415794).

Almost surely, 2^42831587 is an apocalyptic number.

42831587 is a deficient number, since it is larger than the sum of its proper divisors (1).

42831587 is an equidigital number, since it uses as much as digits as its factorization.

42831587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 42831587 is about 6544.5845551876. The cubic root of 42831587 is about 349.8818294943.

The spelling of 42831587 in words is "forty-two million, eight hundred thirty-one thousand, five hundred eighty-seven".