42861647 has 2 divisors, whose sum is σ = 42861648. Its totient is φ = 42861646.

The previous prime is 42861617. The next prime is 42861649. The reversal of 42861647 is 74616824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42861647 is a prime.

Together with 42861649, it forms a pair of twin primes.

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 42861647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42861649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21430823 + 21430824.

It is an arithmetic number, because the mean of its divisors is an integer number (21430824).

Almost surely, 2^42861647 is an apocalyptic number.

42861647 is a deficient number, since it is larger than the sum of its proper divisors (1).

42861647 is an equidigital number, since it uses as much as digits as its factorization.

42861647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 42861647 is about 6546.8807076347. The cubic root of 42861647 is about 349.9636615334.

The spelling of 42861647 in words is "forty-two million, eight hundred sixty-one thousand, six hundred forty-seven".