216861419 has 2 divisors, whose sum is σ = 216861420. Its totient is φ = 216861418.

The previous prime is 216861413. The next prime is 216861433. The reversal of 216861419 is 914168612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216861419 is a prime.

It is a super-2 number, since 2×216861419² = 94057750101387122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216861413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108430709 + 108430710.

It is an arithmetic number, because the mean of its divisors is an integer number (108430710).

Almost surely, 2^216861419 is an apocalyptic number.

216861419 is a deficient number, since it is larger than the sum of its proper divisors (1).

216861419 is an equidigital number, since it uses as much as digits as its factorization.

216861419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 216861419 is about 14726.2153658026. The cubic root of 216861419 is about 600.7965522248.

The spelling of 216861419 in words is "two hundred sixteen million, eight hundred sixty-one thousand, four hundred nineteen".