216319995 has 24 divisors (see below), whose sum is σ = 379478736. Its totient is φ = 113978688.

The previous prime is 216319981. The next prime is 216320009. The reversal of 216319995 is 599913612.

It is a happy number.

216319995 is a `hidden beast` number, since 2 + 1 + 631 + 9 + 9 + 9 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (216319981) and next prime (216320009).

It is not a de Polignac number, because 216319995 - 2⁴ = 216319979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 216319995.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25224 + ... + 32693.

It is an arithmetic number, because the mean of its divisors is an integer number (15811614).

Almost surely, 2^216319995 is an apocalyptic number.

216319995 is a deficient number, since it is larger than the sum of its proper divisors (163158741).

216319995 is a wasteful number, since it uses less digits than its factorization.

216319995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58011 (or 58008 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 216319995 is about 14707.8208787026. The cubic root of 216319995 is about 600.2961454724.

It can be divided in two parts, 21631 and 9995, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 216319995 in words is "two hundred sixteen million, three hundred nineteen thousand, nine hundred ninety-five".