42556289 has 2 divisors, whose sum is σ = 42556290. Its totient is φ = 42556288.

The previous prime is 42556277. The next prime is 42556313. The reversal of 42556289 is 98265524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35796289 + 6760000 = 5983^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42556289 is a prime.

It is a super-2 number, since 2×42556289² = 3622075466903042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42556259) 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, 21278144 + 21278145.

It is an arithmetic number, because the mean of its divisors is an integer number (21278145).

Almost surely, 2^42556289 is an apocalyptic number.

It is an amenable number.

42556289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556289 is an equidigital number, since it uses as much as digits as its factorization.

42556289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 41.

The square root of 42556289 is about 6523.5181459087. The cubic root of 42556289 is about 349.1306013891.

The spelling of 42556289 in words is "forty-two million, five hundred fifty-six thousand, two hundred eighty-nine".