216894361 has 2 divisors, whose sum is σ = 216894362. Its totient is φ = 216894360.

The previous prime is 216894311. The next prime is 216894397. The reversal of 216894361 is 163498612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145660761 + 71233600 = 12069^2 + 8440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216894361 is a prime.

It is not a weakly prime, because it can be changed into another prime (216894311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108447180 + 108447181.

It is an arithmetic number, because the mean of its divisors is an integer number (108447181).

Almost surely, 2^216894361 is an apocalyptic number.

It is an amenable number.

216894361 is a deficient number, since it is larger than the sum of its proper divisors (1).

216894361 is an equidigital number, since it uses as much as digits as its factorization.

216894361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 216894361 is about 14727.3338048677. Note that the first 3 decimals coincide. The cubic root of 216894361 is about 600.8269717097.

The spelling of 216894361 in words is "two hundred sixteen million, eight hundred ninety-four thousand, three hundred sixty-one".