216262505 has 4 divisors (see below), whose sum is σ = 259515012. Its totient is φ = 173010000.

The previous prime is 216262489. The next prime is 216262511. The reversal of 216262505 is 505262612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109160704 + 107101801 = 10448^2 + 10349^2 .

It is not a de Polignac number, because 216262505 - 2⁴ = 216262489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21626246 + ... + 21626255.

It is an arithmetic number, because the mean of its divisors is an integer number (64878753).

Almost surely, 2^216262505 is an apocalyptic number.

It is an amenable number.

216262505 is a deficient number, since it is larger than the sum of its proper divisors (43252507).

216262505 is an equidigital number, since it uses as much as digits as its factorization.

216262505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43252506.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 216262505 is about 14705.8663464619. The cubic root of 216262505 is about 600.2429617879.

The spelling of 216262505 in words is "two hundred sixteen million, two hundred sixty-two thousand, five hundred five".