216412961 has 2 divisors, whose sum is σ = 216412962. Its totient is φ = 216412960.

The previous prime is 216412951. The next prime is 216412979. The reversal of 216412961 is 169214612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135862336 + 80550625 = 11656^2 + 8975^2 .

It is a cyclic number.

It is not a de Polignac number, because 216412961 - 2⁶ = 216412897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (216412901) 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, 108206480 + 108206481.

It is an arithmetic number, because the mean of its divisors is an integer number (108206481).

Almost surely, 2^216412961 is an apocalyptic number.

It is an amenable number.

216412961 is a deficient number, since it is larger than the sum of its proper divisors (1).

216412961 is an equidigital number, since it uses as much as digits as its factorization.

216412961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 216412961 is about 14710.9809666113. The cubic root of 216412961 is about 600.3821278751.

The spelling of 216412961 in words is "two hundred sixteen million, four hundred twelve thousand, nine hundred sixty-one".