216997411 has 2 divisors, whose sum is σ = 216997412. Its totient is φ = 216997410.

The previous prime is 216997399. The next prime is 216997453. The reversal of 216997411 is 114799612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216997411 - 2⁷ = 216997283 is a prime.

It is not a weakly prime, because it can be changed into another prime (216997471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108498705 + 108498706.

It is an arithmetic number, because the mean of its divisors is an integer number (108498706).

Almost surely, 2^216997411 is an apocalyptic number.

216997411 is a deficient number, since it is larger than the sum of its proper divisors (1).

216997411 is an equidigital number, since it uses as much as digits as its factorization.

216997411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 216997411 is about 14730.8319860081. The cubic root of 216997411 is about 600.9221108304.

The spelling of 216997411 in words is "two hundred sixteen million, nine hundred ninety-seven thousand, four hundred eleven".