216149189 has 2 divisors, whose sum is σ = 216149190. Its totient is φ = 216149188.

The previous prime is 216149179. The next prime is 216149201. The reversal of 216149189 is 981941612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144408289 + 71740900 = 12017^2 + 8470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216149189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216149119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108074594 + 108074595.

It is an arithmetic number, because the mean of its divisors is an integer number (108074595).

Almost surely, 2^216149189 is an apocalyptic number.

It is an amenable number.

216149189 is a deficient number, since it is larger than the sum of its proper divisors (1).

216149189 is an equidigital number, since it uses as much as digits as its factorization.

216149189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 216149189 is about 14702.0130934508. The cubic root of 216149189 is about 600.1381061717.

It can be divided in two parts, 21614 and 9189, that added together give a palindrome (30803).

The spelling of 216149189 in words is "two hundred sixteen million, one hundred forty-nine thousand, one hundred eighty-nine".