42556999 has 2 divisors, whose sum is σ = 42557000. Its totient is φ = 42556998.

The previous prime is 42556963. The next prime is 42557051. The reversal of 42556999 is 99965524.

42556999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42556999 - 2¹⁵ = 42524231 is a prime.

It is a super-2 number, since 2×42556999² = 3622196327772002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42556909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21278499 + 21278500.

It is an arithmetic number, because the mean of its divisors is an integer number (21278500).

Almost surely, 2^42556999 is an apocalyptic number.

42556999 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556999 is an equidigital number, since it uses as much as digits as its factorization.

42556999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 42556999 is about 6523.5725641706. The cubic root of 42556999 is about 349.1325429850.

The spelling of 42556999 in words is "forty-two million, five hundred fifty-six thousand, nine hundred ninety-nine".