216051251 has 8 divisors (see below), whose sum is σ = 238959504. Its totient is φ = 194041440.

The previous prime is 216051239. The next prime is 216051271. The reversal of 216051251 is 152150612.

It is a happy number.

216051251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216051251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216051271) 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, 224105 + ... + 225066.

It is an arithmetic number, because the mean of its divisors is an integer number (29869938).

Almost surely, 2^216051251 is an apocalyptic number.

216051251 is a deficient number, since it is larger than the sum of its proper divisors (22908253).

216051251 is a wasteful number, since it uses less digits than its factorization.

216051251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449221.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 216051251 is about 14698.6819477122. The cubic root of 216051251 is about 600.0474508769.

The spelling of 216051251 in words is "two hundred sixteen million, fifty-one thousand, two hundred fifty-one".