216569051 has 2 divisors, whose sum is σ = 216569052. Its totient is φ = 216569050.

The previous prime is 216569009. The next prime is 216569053. The reversal of 216569051 is 150965612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216569051 is a prime.

It is a Sophie Germain prime.

Together with 216569053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216569053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108284525 + 108284526.

It is an arithmetic number, because the mean of its divisors is an integer number (108284526).

Almost surely, 2^216569051 is an apocalyptic number.

216569051 is a deficient number, since it is larger than the sum of its proper divisors (1).

216569051 is an equidigital number, since it uses as much as digits as its factorization.

216569051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 216569051 is about 14716.2852309949. The cubic root of 216569051 is about 600.5264370457.

The spelling of 216569051 in words is "two hundred sixteen million, five hundred sixty-nine thousand, fifty-one".