216515 has 8 divisors (see below), whose sum is σ = 279888. Its totient is φ = 159840.

The previous prime is 216509. The next prime is 216523. The reversal of 216515 is 515612.

216515 = 123² + 124² + ... + 135².

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

It is not a de Polignac number, because 216515 - 2⁶ = 216451 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 1730.

It is an arithmetic number, because the mean of its divisors is an integer number (34986).

2²¹⁶⁵¹⁵ is an apocalyptic number.

216515 is a deficient number, since it is larger than the sum of its proper divisors (63373).

216515 is a wasteful number, since it uses less digits than its factorization.

216515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349.

The product of its digits is 300, while the sum is 20.

The square root of 216515 is about 465.3117234715. The cubic root of 216515 is about 60.0476473374.

The spelling of 216515 in words is "two hundred sixteen thousand, five hundred fifteen".