216205951 has 8 divisors (see below), whose sum is σ = 234899280. Its totient is φ = 197807232.

The previous prime is 216205931. The next prime is 216205963. The reversal of 216205951 is 159502612.

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 216205951 - 2²⁷ = 81988223 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 (216205931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72121 + ... + 75058.

It is an arithmetic number, because the mean of its divisors is an integer number (29362410).

Almost surely, 2^216205951 is an apocalyptic number.

216205951 is a deficient number, since it is larger than the sum of its proper divisors (18693329).

216205951 is a wasteful number, since it uses less digits than its factorization.

216205951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147305.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 216205951 is about 14703.9433826440. The cubic root of 216205951 is about 600.1906347946.

It can be divided in two parts, 216205 and 951, that added together give a square (217156 = 466²).

The spelling of 216205951 in words is "two hundred sixteen million, two hundred five thousand, nine hundred fifty-one".