42564887 has 2 divisors, whose sum is σ = 42564888. Its totient is φ = 42564886.

The previous prime is 42564871. The next prime is 42564931. The reversal of 42564887 is 78846524.

It is an a-pointer prime, because the next prime (42564931) can be obtained adding 42564887 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42564887 - 2⁴ = 42564871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42564857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21282443 + 21282444.

It is an arithmetic number, because the mean of its divisors is an integer number (21282444).

Almost surely, 2^42564887 is an apocalyptic number.

42564887 is a deficient number, since it is larger than the sum of its proper divisors (1).

42564887 is an equidigital number, since it uses as much as digits as its factorization.

42564887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 44.

The square root of 42564887 is about 6524.1771128626. The cubic root of 42564887 is about 349.1541123894.

The spelling of 42564887 in words is "forty-two million, five hundred sixty-four thousand, eight hundred eighty-seven".