42556001 has 2 divisors, whose sum is σ = 42556002. Its totient is φ = 42556000.

The previous prime is 42555983. The next prime is 42556037. The reversal of 42556001 is 10065524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41267776 + 1288225 = 6424^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 42556001 - 2¹⁴ = 42539617 is a prime.

It is a super-2 number, since 2×42556001² = 3622026442224002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42556061) 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, 21278000 + 21278001.

It is an arithmetic number, because the mean of its divisors is an integer number (21278001).

Almost surely, 2^42556001 is an apocalyptic number.

It is an amenable number.

42556001 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556001 is an equidigital number, since it uses as much as digits as its factorization.

42556001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 42556001 is about 6523.4960718927. The cubic root of 42556001 is about 349.1298138060.

The spelling of 42556001 in words is "forty-two million, five hundred fifty-six thousand, one".