216131569 has 2 divisors, whose sum is σ = 216131570. Its totient is φ = 216131568.

The previous prime is 216131563. The next prime is 216131579. The reversal of 216131569 is 965131612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173712400 + 42419169 = 13180^2 + 6513^2 .

It is a cyclic number.

It is not a de Polignac number, because 216131569 - 2³ = 216131561 is a prime.

It is a super-2 number, since 2×216131569² = 93425710236803522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216131561) by changing a digit.

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 as a sum of consecutive naturals, namely, 108065784 + 108065785.

It is an arithmetic number, because the mean of its divisors is an integer number (108065785).

Almost surely, 2^216131569 is an apocalyptic number.

It is an amenable number.

216131569 is a deficient number, since it is larger than the sum of its proper divisors (1).

216131569 is an equidigital number, since it uses as much as digits as its factorization.

216131569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 216131569 is about 14701.4138435730. The cubic root of 216131569 is about 600.1217984217.

The spelling of 216131569 in words is "two hundred sixteen million, one hundred thirty-one thousand, five hundred sixty-nine".