216538967 has 2 divisors, whose sum is σ = 216538968. Its totient is φ = 216538966.

The previous prime is 216538963. The next prime is 216538981. The reversal of 216538967 is 769835612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216538967 - 2² = 216538963 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216538963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108269483 + 108269484.

It is an arithmetic number, because the mean of its divisors is an integer number (108269484).

Almost surely, 2^216538967 is an apocalyptic number.

216538967 is a deficient number, since it is larger than the sum of its proper divisors (1).

216538967 is an equidigital number, since it uses as much as digits as its factorization.

216538967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 216538967 is about 14715.2630625484. The cubic root of 216538967 is about 600.4986290189.

It can be divided in two parts, 2165 and 38967, that multiplied together give a triangular number (84363555 = T₁₂₉₈₉).

The spelling of 216538967 in words is "two hundred sixteen million, five hundred thirty-eight thousand, nine hundred sixty-seven".