216479191 has 2 divisors, whose sum is σ = 216479192. Its totient is φ = 216479190.

The previous prime is 216479183. The next prime is 216479273. The reversal of 216479191 is 191974612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216479191 - 2³ = 216479183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216479491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108239595 + 108239596.

It is an arithmetic number, because the mean of its divisors is an integer number (108239596).

Almost surely, 2^216479191 is an apocalyptic number.

216479191 is a deficient number, since it is larger than the sum of its proper divisors (1).

216479191 is an equidigital number, since it uses as much as digits as its factorization.

216479191 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 216479191 is about 14713.2318339650. The cubic root of 216479191 is about 600.4433676649.

The spelling of 216479191 in words is "two hundred sixteen million, four hundred seventy-nine thousand, one hundred ninety-one".