216515419 has 2 divisors, whose sum is σ = 216515420. Its totient is φ = 216515418.

The previous prime is 216515407. The next prime is 216515437. The reversal of 216515419 is 914515612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216515419 - 2²³ = 208126811 is a prime.

It is a super-2 number, since 2×216515419² = 93757853329491122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216515489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108257709 + 108257710.

It is an arithmetic number, because the mean of its divisors is an integer number (108257710).

Almost surely, 2^216515419 is an apocalyptic number.

216515419 is a deficient number, since it is larger than the sum of its proper divisors (1).

216515419 is an equidigital number, since it uses as much as digits as its factorization.

216515419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 216515419 is about 14714.4629191826. The cubic root of 216515419 is about 600.4768607208.

The spelling of 216515419 in words is "two hundred sixteen million, five hundred fifteen thousand, four hundred nineteen".