216145427 has 2 divisors, whose sum is σ = 216145428. Its totient is φ = 216145426.

The previous prime is 216145411. The next prime is 216145469. The reversal of 216145427 is 724541612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216145427 - 2⁴ = 216145411 is a prime.

It is a super-2 number, since 2×216145427² = 93437691226024658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216145393 and 216145402.

It is not a weakly prime, because it can be changed into another prime (216645427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108072713 + 108072714.

It is an arithmetic number, because the mean of its divisors is an integer number (108072714).

Almost surely, 2^216145427 is an apocalyptic number.

216145427 is a deficient number, since it is larger than the sum of its proper divisors (1).

216145427 is an equidigital number, since it uses as much as digits as its factorization.

216145427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 216145427 is about 14701.8851512315. The cubic root of 216145427 is about 600.1346244211.

The spelling of 216145427 in words is "two hundred sixteen million, one hundred forty-five thousand, four hundred twenty-seven".