216145747 has 2 divisors, whose sum is σ = 216145748. Its totient is φ = 216145746.

The previous prime is 216145739. The next prime is 216145763. The reversal of 216145747 is 747541612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216145747 - 2³ = 216145739 is a prime.

It is not a weakly prime, because it can be changed into another prime (216145717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108072873 + 108072874.

It is an arithmetic number, because the mean of its divisors is an integer number (108072874).

Almost surely, 2^216145747 is an apocalyptic number.

216145747 is a deficient number, since it is larger than the sum of its proper divisors (1).

216145747 is an equidigital number, since it uses as much as digits as its factorization.

216145747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 216145747 is about 14701.8960341855. The cubic root of 216145747 is about 600.1349205844.

The spelling of 216145747 in words is "two hundred sixteen million, one hundred forty-five thousand, seven hundred forty-seven".