216985515 has 32 divisors (see below), whose sum is σ = 351624000. Its totient is φ = 114255360.

The previous prime is 216985507. The next prime is 216985541. The reversal of 216985515 is 515589612.

It is a happy number.

It is not a de Polignac number, because 216985515 - 2³ = 216985507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 621561 + ... + 621909.

It is an arithmetic number, because the mean of its divisors is an integer number (10988250).

Almost surely, 2^216985515 is an apocalyptic number.

216985515 is a deficient number, since it is larger than the sum of its proper divisors (134638485).

216985515 is a wasteful number, since it uses less digits than its factorization.

216985515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its digits is 108000, while the sum is 42.

The square root of 216985515 is about 14730.4282015154. The cubic root of 216985515 is about 600.9111295933.

The spelling of 216985515 in words is "two hundred sixteen million, nine hundred eighty-five thousand, five hundred fifteen".