42556847 has 2 divisors, whose sum is σ = 42556848. Its totient is φ = 42556846.

The previous prime is 42556841. The next prime is 42556849. The reversal of 42556847 is 74865524.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42556847 is a prime.

It is a super-2 number, since 2×42556847² = 3622170453162818, which contains 22 as substring.

Together with 42556849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42556841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21278423 + 21278424.

It is an arithmetic number, because the mean of its divisors is an integer number (21278424).

Almost surely, 2^42556847 is an apocalyptic number.

42556847 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556847 is an equidigital number, since it uses as much as digits as its factorization.

42556847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 41.

The square root of 42556847 is about 6523.5609141021. The cubic root of 42556847 is about 349.1321273212.

The spelling of 42556847 in words is "forty-two million, five hundred fifty-six thousand, eight hundred forty-seven".