216131353 has 4 divisors (see below), whose sum is σ = 228844980. Its totient is φ = 203417728.

The previous prime is 216131351. The next prime is 216131401. The reversal of 216131353 is 353131612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133448704 + 82682649 = 11552^2 + 9093^2 .

It is a cyclic number.

It is not a de Polignac number, because 216131353 - 2¹ = 216131351 is a prime.

It is a super-2 number, since 2×216131353² = 93425523499221218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216131351) 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, 6356788 + ... + 6356821.

It is an arithmetic number, because the mean of its divisors is an integer number (57211245).

Almost surely, 2^216131353 is an apocalyptic number.

It is an amenable number.

216131353 is a deficient number, since it is larger than the sum of its proper divisors (12713627).

216131353 is a wasteful number, since it uses less digits than its factorization.

216131353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12713626.

The product of its digits is 1620, while the sum is 25.

The square root of 216131353 is about 14701.4064973390. The cubic root of 216131353 is about 600.1215985028.

Adding to 216131353 its reverse (353131612), we get a palindrome (569262965).

The spelling of 216131353 in words is "two hundred sixteen million, one hundred thirty-one thousand, three hundred fifty-three".