216471061 has 4 divisors (see below), whose sum is σ = 219436492. Its totient is φ = 213505632.

The previous prime is 216471041. The next prime is 216471071. The reversal of 216471061 is 160174612.

216471061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65918161 + 150552900 = 8119^2 + 12270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216471061 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 (216471001) 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, 1482606 + ... + 1482751.

It is an arithmetic number, because the mean of its divisors is an integer number (54859123).

Almost surely, 2^216471061 is an apocalyptic number.

It is an amenable number.

216471061 is a deficient number, since it is larger than the sum of its proper divisors (2965431).

216471061 is an equidigital number, since it uses as much as digits as its factorization.

216471061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965430.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 216471061 is about 14712.9555494469. The cubic root of 216471061 is about 600.4358509059.

The spelling of 216471061 in words is "two hundred sixteen million, four hundred seventy-one thousand, sixty-one".