216611241 has 32 divisors (see below), whose sum is σ = 368879616. Its totient is φ = 109776000.

The previous prime is 216611233. The next prime is 216611249. The reversal of 216611241 is 142116612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216611233) and next prime (216611249).

It is not a de Polignac number, because 216611241 - 2³ = 216611233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216611249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1965 + ... + 20906.

It is an arithmetic number, because the mean of its divisors is an integer number (11527488).

Almost surely, 2^216611241 is an apocalyptic number.

216611241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

216611241 is a deficient number, since it is larger than the sum of its proper divisors (152268375).

216611241 is a wasteful number, since it uses less digits than its factorization.

216611241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22933.

The product of its digits is 576, while the sum is 24.

The square root of 216611241 is about 14717.7186071755. The cubic root of 216611241 is about 600.5654308681.

Adding to 216611241 its reverse (142116612), we get a palindrome (358727853).

The spelling of 216611241 in words is "two hundred sixteen million, six hundred eleven thousand, two hundred forty-one".