216389741 has 4 divisors (see below), whose sum is σ = 216600252. Its totient is φ = 216179232.

The previous prime is 216389731. The next prime is 216389807. The reversal of 216389741 is 147983612.

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 177688900 + 38700841 = 13330^2 + 6221^2 .

It is a cyclic number.

It is not a de Polignac number, because 216389741 - 2¹⁴ = 216373357 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 (216389731) 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, 103706 + ... + 105771.

It is an arithmetic number, because the mean of its divisors is an integer number (54150063).

Almost surely, 2^216389741 is an apocalyptic number.

It is an amenable number.

216389741 is a deficient number, since it is larger than the sum of its proper divisors (210511).

216389741 is a wasteful number, since it uses less digits than its factorization.

216389741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210510.

The product of its digits is 72576, while the sum is 41.

The square root of 216389741 is about 14710.1917390631. The cubic root of 216389741 is about 600.3606544668.

The spelling of 216389741 in words is "two hundred sixteen million, three hundred eighty-nine thousand, seven hundred forty-one".