216681467 has 4 divisors (see below), whose sum is σ = 218335656. Its totient is φ = 215027280.

The previous prime is 216681457. The next prime is 216681481. The reversal of 216681467 is 764186612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216681467 - 2¹² = 216677371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216681407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826898 + ... + 827159.

It is an arithmetic number, because the mean of its divisors is an integer number (54583914).

Almost surely, 2^216681467 is an apocalyptic number.

216681467 is a deficient number, since it is larger than the sum of its proper divisors (1654189).

216681467 is a wasteful number, since it uses less digits than its factorization.

216681467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654188.

The product of its digits is 96768, while the sum is 41.

The square root of 216681467 is about 14720.1041776205. The cubic root of 216681467 is about 600.6303255473.

The spelling of 216681467 in words is "two hundred sixteen million, six hundred eighty-one thousand, four hundred sixty-seven".