216334549 has 2 divisors, whose sum is σ = 216334550. Its totient is φ = 216334548.

The previous prime is 216334493. The next prime is 216334583. The reversal of 216334549 is 945433612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208947025 + 7387524 = 14455^2 + 2718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216334549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216334249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108167274 + 108167275.

It is an arithmetic number, because the mean of its divisors is an integer number (108167275).

Almost surely, 2^216334549 is an apocalyptic number.

It is an amenable number.

216334549 is a deficient number, since it is larger than the sum of its proper divisors (1).

216334549 is an equidigital number, since it uses as much as digits as its factorization.

216334549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

The square root of 216334549 is about 14708.3156411603. The cubic root of 216334549 is about 600.3096078035.

The spelling of 216334549 in words is "two hundred sixteen million, three hundred thirty-four thousand, five hundred forty-nine".