216998522 has 8 divisors (see below), whose sum is σ = 350536116. Its totient is φ = 100153152.

The previous prime is 216998521. The next prime is 216998549. The reversal of 216998522 is 225899612.

It can be written as a sum of positive squares in 2 ways, for example, as 198499921 + 18498601 = 14089^2 + 4301^2 .

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

It is not an unprimeable number, because it can be changed into a prime (216998521) 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, 4173023 + ... + 4173074.

Almost surely, 2^216998522 is an apocalyptic number.

216998522 is a deficient number, since it is larger than the sum of its proper divisors (133537594).

216998522 is a wasteful number, since it uses less digits than its factorization.

216998522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346112.

The product of its digits is 155520, while the sum is 44.

The square root of 216998522 is about 14730.8696959820. The cubic root of 216998522 is about 600.9231363777.

The spelling of 216998522 in words is "two hundred sixteen million, nine hundred ninety-eight thousand, five hundred twenty-two".