42856213 has 2 divisors, whose sum is σ = 42856214. Its totient is φ = 42856212.

The previous prime is 42856207. The next prime is 42856217. The reversal of 42856213 is 31265824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41899729 + 956484 = 6473^2 + 978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42856213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42856217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428106 + 21428107.

It is an arithmetic number, because the mean of its divisors is an integer number (21428107).

Almost surely, 2^42856213 is an apocalyptic number.

It is an amenable number.

42856213 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856213 is an equidigital number, since it uses as much as digits as its factorization.

42856213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 42856213 is about 6546.4656876822. The cubic root of 42856213 is about 349.9488714430.

The spelling of 42856213 in words is "forty-two million, eight hundred fifty-six thousand, two hundred thirteen".