216882551 has 4 divisors (see below), whose sum is σ = 220119672. Its totient is φ = 213645432.

The previous prime is 216882539. The next prime is 216882553. The reversal of 216882551 is 155288612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216882551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216882553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618460 + ... + 1618593.

It is an arithmetic number, because the mean of its divisors is an integer number (55029918).

Almost surely, 2^216882551 is an apocalyptic number.

216882551 is a deficient number, since it is larger than the sum of its proper divisors (3237121).

216882551 is an equidigital number, since it uses as much as digits as its factorization.

216882551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3237120.

The product of its digits is 38400, while the sum is 38.

The square root of 216882551 is about 14726.9328442823. The cubic root of 216882551 is about 600.8160664080.

The spelling of 216882551 in words is "two hundred sixteen million, eight hundred eighty-two thousand, five hundred fifty-one".