42520217 has 2 divisors, whose sum is σ = 42520218. Its totient is φ = 42520216.

The previous prime is 42520211. The next prime is 42520259. The reversal of 42520217 is 71202524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24364096 + 18156121 = 4936^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 42520217 - 2¹⁴ = 42503833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42520192 and 42520201.

It is not a weakly prime, because it can be changed into another prime (42520211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260108 + 21260109.

It is an arithmetic number, because the mean of its divisors is an integer number (21260109).

Almost surely, 2^42520217 is an apocalyptic number.

It is an amenable number.

42520217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42520217 is an equidigital number, since it uses as much as digits as its factorization.

42520217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 42520217 is about 6520.7527939648. The cubic root of 42520217 is about 349.0319289458.

The spelling of 42520217 in words is "forty-two million, five hundred twenty thousand, two hundred seventeen".