216342506 has 4 divisors (see below), whose sum is σ = 324513762. Its totient is φ = 108171252.

The previous prime is 216342491. The next prime is 216342509. The reversal of 216342506 is 605243612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 153536881 + 62805625 = 12391^2 + 7925^2 .

It is not an unprimeable number, because it can be changed into a prime (216342509) 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 as a sum of consecutive naturals, namely, 54085625 + ... + 54085628.

Almost surely, 2^216342506 is an apocalyptic number.

216342506 is a deficient number, since it is larger than the sum of its proper divisors (108171256).

216342506 is a wasteful number, since it uses less digits than its factorization.

216342506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108171255.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216342506 is about 14708.5861319163. The cubic root of 216342506 is about 600.3169677082.

The spelling of 216342506 in words is "two hundred sixteen million, three hundred forty-two thousand, five hundred six".