216508149 has 24 divisors (see below), whose sum is σ = 367409952. Its totient is φ = 121122720.

The previous prime is 216508081. The next prime is 216508153. The reversal of 216508149 is 941805612.

216508149 is a `hidden beast` number, since 2 + 1 + 6 + 508 + 149 = 666.

It is not a de Polignac number, because 216508149 - 2¹³ = 216499957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216508199) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82827 + ... + 85400.

It is an arithmetic number, because the mean of its divisors is an integer number (15308748).

Almost surely, 2^216508149 is an apocalyptic number.

It is an amenable number.

216508149 is a deficient number, since it is larger than the sum of its proper divisors (150901803).

216508149 is a wasteful number, since it uses less digits than its factorization.

216508149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168257 (or 168254 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 216508149 is about 14714.2158812490. The cubic root of 216508149 is about 600.4701398513.

The spelling of 216508149 in words is "two hundred sixteen million, five hundred eight thousand, one hundred forty-nine".