216249999 has 8 divisors (see below), whose sum is σ = 329523840. Its totient is φ = 123571416.

The previous prime is 216249997. The next prime is 216250003. The reversal of 216249999 is 999942612.

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

It is not a de Polignac number, because 216249999 - 2¹ = 216249997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216249991) 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, 5148789 + ... + 5148830.

It is an arithmetic number, because the mean of its divisors is an integer number (41190480).

Almost surely, 2^216249999 is an apocalyptic number.

216249999 is a deficient number, since it is larger than the sum of its proper divisors (113273841).

216249999 is a wasteful number, since it uses less digits than its factorization.

216249999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10297629.

The product of its digits is 629856, while the sum is 51.

The square root of 216249999 is about 14705.4411358517. The cubic root of 216249999 is about 600.2313913075.

The spelling of 216249999 in words is "two hundred sixteen million, two hundred forty-nine thousand, nine hundred ninety-nine".