216061915 has 8 divisors (see below), whose sum is σ = 259416000. Its totient is φ = 172755072.

The previous prime is 216061913. The next prime is 216061921. The reversal of 216061915 is 519160612.

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 216061915 - 2¹ = 216061913 is a prime.

It is a super-2 number, since 2×216061915² = 93365502226934450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216061913) 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, 814 + ... + 20803.

It is an arithmetic number, because the mean of its divisors is an integer number (32427000).

Almost surely, 2^216061915 is an apocalyptic number.

216061915 is a deficient number, since it is larger than the sum of its proper divisors (43354085).

216061915 is a wasteful number, since it uses less digits than its factorization.

216061915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23621.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 216061915 is about 14699.0446968502. The cubic root of 216061915 is about 600.0573232269.

The spelling of 216061915 in words is "two hundred sixteen million, sixty-one thousand, nine hundred fifteen".