30805217 has 2 divisors, whose sum is σ = 30805218. Its totient is φ = 30805216.

The previous prime is 30805199. The next prime is 30805237. The reversal of 30805217 is 71250803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 4682896 = 5111^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 30805217 - 2¹⁴ = 30788833 is a prime.

It is a super-2 number, since 2×30805217² = 1897922788834178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30805237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15402608 + 15402609.

It is an arithmetic number, because the mean of its divisors is an integer number (15402609).

Almost surely, 2^30805217 is an apocalyptic number.

It is an amenable number.

30805217 is a deficient number, since it is larger than the sum of its proper divisors (1).

30805217 is an equidigital number, since it uses as much as digits as its factorization.

30805217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 30805217 is about 5550.2447693773. The cubic root of 30805217 is about 313.4787387850.

The spelling of 30805217 in words is "thirty million, eight hundred five thousand, two hundred seventeen".