216499297 has 24 divisors (see below), whose sum is σ = 261999360. Its totient is φ = 178164000.

The previous prime is 216499291. The next prime is 216499303. The reversal of 216499297 is 792994612.

It is an interprime number because it is at equal distance from previous prime (216499291) and next prime (216499303).

It is not a de Polignac number, because 216499297 - 2³ = 216499289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 216499297.

It is not an unprimeable number, because it can be changed into a prime (216499291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356368 + ... + 356974.

It is an arithmetic number, because the mean of its divisors is an integer number (10916640).

Almost surely, 2^216499297 is an apocalyptic number.

It is an amenable number.

216499297 is a deficient number, since it is larger than the sum of its proper divisors (45500063).

216499297 is a wasteful number, since it uses less digits than its factorization.

216499297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 894 counting only the distinct ones).

The product of its digits is 489888, while the sum is 49.

The square root of 216499297 is about 14713.9150806303. The cubic root of 216499297 is about 600.4619562731.

The spelling of 216499297 in words is "two hundred sixteen million, four hundred ninety-nine thousand, two hundred ninety-seven".