216131563 has 2 divisors, whose sum is σ = 216131564. Its totient is φ = 216131562.

The previous prime is 216131561. The next prime is 216131569. The reversal of 216131563 is 365131612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216131563 - 2¹ = 216131561 is a prime.

Together with 216131561, it forms a pair of twin primes.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108065781 + 108065782.

It is an arithmetic number, because the mean of its divisors is an integer number (108065782).

Almost surely, 2^216131563 is an apocalyptic number.

216131563 is a deficient number, since it is larger than the sum of its proper divisors (1).

216131563 is an equidigital number, since it uses as much as digits as its factorization.

216131563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 216131563 is about 14701.4136395110. The cubic root of 216131563 is about 600.1217928684.

The spelling of 216131563 in words is "two hundred sixteen million, one hundred thirty-one thousand, five hundred sixty-three".