42312217 has 2 divisors, whose sum is σ = 42312218. Its totient is φ = 42312216.

The previous prime is 42312211. The next prime is 42312239. The reversal of 42312217 is 71221324.

It is an a-pointer prime, because the next prime (42312239) can be obtained adding 42312217 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42302016 + 10201 = 6504^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 42312217 - 2²³ = 33923609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42312211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21156108 + 21156109.

It is an arithmetic number, because the mean of its divisors is an integer number (21156109).

Almost surely, 2^42312217 is an apocalyptic number.

It is an amenable number.

42312217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42312217 is an equidigital number, since it uses as much as digits as its factorization.

42312217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 42312217 is about 6504.7841624454. The cubic root of 42312217 is about 348.4618680177.

The spelling of 42312217 in words is "forty-two million, three hundred twelve thousand, two hundred seventeen".