42581047 has 2 divisors, whose sum is σ = 42581048. Its totient is φ = 42581046.

The previous prime is 42581041. The next prime is 42581081. The reversal of 42581047 is 74018524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42581047 - 2¹⁵ = 42548279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42581041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21290523 + 21290524.

It is an arithmetic number, because the mean of its divisors is an integer number (21290524).

Almost surely, 2^42581047 is an apocalyptic number.

42581047 is a deficient number, since it is larger than the sum of its proper divisors (1).

42581047 is an equidigital number, since it uses as much as digits as its factorization.

42581047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 42581047 is about 6525.4154657002. The cubic root of 42581047 is about 349.1982929097.

The spelling of 42581047 in words is "forty-two million, five hundred eighty-one thousand, forty-seven".