216634841 has 2 divisors, whose sum is σ = 216634842. Its totient is φ = 216634840.

The previous prime is 216634819. The next prime is 216634877. The reversal of 216634841 is 148436612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164737225 + 51897616 = 12835^2 + 7204^2 .

It is a cyclic number.

It is not a de Polignac number, because 216634841 - 2⁶ = 216634777 is a prime.

It is not a weakly prime, because it can be changed into another prime (216633841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108317420 + 108317421.

It is an arithmetic number, because the mean of its divisors is an integer number (108317421).

Almost surely, 2^216634841 is an apocalyptic number.

It is an amenable number.

216634841 is a deficient number, since it is larger than the sum of its proper divisors (1).

216634841 is an equidigital number, since it uses as much as digits as its factorization.

216634841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 216634841 is about 14718.5203400342. The cubic root of 216634841 is about 600.5872408003.

The spelling of 216634841 in words is "two hundred sixteen million, six hundred thirty-four thousand, eight hundred forty-one".