216246549 has 4 divisors (see below), whose sum is σ = 288328736. Its totient is φ = 144164364.

The previous prime is 216246523. The next prime is 216246551. The reversal of 216246549 is 945642612.

It is a happy number.

216246549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 216246549 - 2²³ = 207857941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216246559) 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, 36041089 + ... + 36041094.

It is an arithmetic number, because the mean of its divisors is an integer number (72082184).

Almost surely, 2^216246549 is an apocalyptic number.

It is an amenable number.

216246549 is a deficient number, since it is larger than the sum of its proper divisors (72082187).

216246549 is an equidigital number, since it uses as much as digits as its factorization.

216246549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72082186.

The product of its digits is 103680, while the sum is 39.

The square root of 216246549 is about 14705.3238318644. The cubic root of 216246549 is about 600.2281993086.

The spelling of 216246549 in words is "two hundred sixteen million, two hundred forty-six thousand, five hundred forty-nine".