216171562 has 4 divisors (see below), whose sum is σ = 324257346. Its totient is φ = 108085780.

The previous prime is 216171533. The next prime is 216171563. The reversal of 216171562 is 265171612.

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., 214066161 + 2105401 = 14631^2 + 1451^2 .

It is not an unprimeable number, because it can be changed into a prime (216171563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54042889 + ... + 54042892.

Almost surely, 2^216171562 is an apocalyptic number.

216171562 is a deficient number, since it is larger than the sum of its proper divisors (108085784).

216171562 is a wasteful number, since it uses less digits than its factorization.

216171562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108085783.

The product of its digits is 5040, while the sum is 31.

The square root of 216171562 is about 14702.7739559581. The cubic root of 216171562 is about 600.1588116648.

Subtracting 216171562 from its reverse (265171612), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 216171562 in words is "two hundred sixteen million, one hundred seventy-one thousand, five hundred sixty-two".