216534541 has 6 divisors (see below), whose sum is σ = 221689230. Its totient is φ = 211497048.

The previous prime is 216534533. The next prime is 216534569. The reversal of 216534541 is 145435612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 163098441 + 53436100 = 12771^2 + 7310^2 .

It is not a de Polignac number, because 216534541 - 2³ = 216534533 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 (216534511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56706 + ... + 60403.

It is an arithmetic number, because the mean of its divisors is an integer number (36948205).

Almost surely, 2^216534541 is an apocalyptic number.

It is an amenable number.

216534541 is a deficient number, since it is larger than the sum of its proper divisors (5154689).

216534541 is an equidigital number, since it uses as much as digits as its factorization.

216534541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117195 (or 117152 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 216534541 is about 14715.1126737107. The cubic root of 216534541 is about 600.4945376459.

The spelling of 216534541 in words is "two hundred sixteen million, five hundred thirty-four thousand, five hundred forty-one".