216205230731 has 8 divisors (see below), whose sum is σ = 249400961280. Its totient is φ = 183586817448.

The previous prime is 216205230721. The next prime is 216205230737. The reversal of 216205230731 is 137032502612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216205230731 - 2¹⁴ = 216205214347 is a prime.

It is a super-2 number, since 2×216205230731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216205230737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144328511 + ... + 144330008.

It is an arithmetic number, because the mean of its divisors is an integer number (31175120160).

Almost surely, 2^216205230731 is an apocalyptic number.

216205230731 is a deficient number, since it is larger than the sum of its proper divisors (33195730549).

216205230731 is a wasteful number, since it uses less digits than its factorization.

216205230731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288658633.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 216205230731 in words is "two hundred sixteen billion, two hundred five million, two hundred thirty thousand, seven hundred thirty-one".