216517051 has 16 divisors (see below), whose sum is σ = 228076288. Its totient is φ = 205286400.

The previous prime is 216517043. The next prime is 216517099. The reversal of 216517051 is 150715612.

It is a cyclic number.

It is not a de Polignac number, because 216517051 - 2³ = 216517043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216517001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545185 + ... + 545581.

It is an arithmetic number, because the mean of its divisors is an integer number (14254768).

Almost surely, 2^216517051 is an apocalyptic number.

216517051 is a deficient number, since it is larger than the sum of its proper divisors (11559237).

216517051 is a wasteful number, since it uses less digits than its factorization.

216517051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 216517051 is about 14714.5183747209. The cubic root of 216517051 is about 600.4783694290.

The spelling of 216517051 in words is "two hundred sixteen million, five hundred seventeen thousand, fifty-one".