216988249 has 4 divisors (see below), whose sum is σ = 217140480. Its totient is φ = 216836020.

The previous prime is 216988231. The next prime is 216988259. The reversal of 216988249 is 942889612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216988249 - 2⁹ = 216987737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216988229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73957 + ... + 76834.

It is an arithmetic number, because the mean of its divisors is an integer number (54285120).

Almost surely, 2^216988249 is an apocalyptic number.

It is an amenable number.

216988249 is a deficient number, since it is larger than the sum of its proper divisors (152231).

216988249 is a wasteful number, since it uses less digits than its factorization.

216988249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152230.

The product of its digits is 497664, while the sum is 49.

The square root of 216988249 is about 14730.5210023271. The cubic root of 216988249 is about 600.9136533933.

The spelling of 216988249 in words is "two hundred sixteen million, nine hundred eighty-eight thousand, two hundred forty-nine".