216551141 has 4 divisors (see below), whose sum is σ = 225966432. Its totient is φ = 207135852.

The previous prime is 216551099. The next prime is 216551173. The reversal of 216551141 is 141155612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216551141 - 2¹⁴ = 216534757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216551141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216551191) 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, 4707611 + ... + 4707656.

It is an arithmetic number, because the mean of its divisors is an integer number (56491608).

Almost surely, 2^216551141 is an apocalyptic number.

It is an amenable number.

216551141 is a deficient number, since it is larger than the sum of its proper divisors (9415291).

216551141 is an equidigital number, since it uses as much as digits as its factorization.

216551141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9415290.

The product of its digits is 1200, while the sum is 26.

The square root of 216551141 is about 14715.6767088707. The cubic root of 216551141 is about 600.5098823180.

The spelling of 216551141 in words is "two hundred sixteen million, five hundred fifty-one thousand, one hundred forty-one".