216767641 has 2 divisors, whose sum is σ = 216767642. Its totient is φ = 216767640.

The previous prime is 216767633. The next prime is 216767647. The reversal of 216767641 is 146767612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182790400 + 33977241 = 13520^2 + 5829^2 .

It is a cyclic number.

It is not a de Polignac number, because 216767641 - 2³ = 216767633 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216767594 and 216767603.

It is not a weakly prime, because it can be changed into another prime (216767647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108383820 + 108383821.

It is an arithmetic number, because the mean of its divisors is an integer number (108383821).

Almost surely, 2^216767641 is an apocalyptic number.

It is an amenable number.

216767641 is a deficient number, since it is larger than the sum of its proper divisors (1).

216767641 is an equidigital number, since it uses as much as digits as its factorization.

216767641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 216767641 is about 14723.0309719161. The cubic root of 216767641 is about 600.7099383516.

The spelling of 216767641 in words is "two hundred sixteen million, seven hundred sixty-seven thousand, six hundred forty-one".