216711157 has 8 divisors (see below), whose sum is σ = 233564184. Its totient is φ = 199884288.

The previous prime is 216711139. The next prime is 216711161. The reversal of 216711157 is 751117612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44209201 + 172501956 = 6649^2 + 13134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216711157 - 2¹¹ = 216709109 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 (216711107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12813 + ... + 24445.

It is an arithmetic number, because the mean of its divisors is an integer number (29195523).

Almost surely, 2^216711157 is an apocalyptic number.

It is an amenable number.

216711157 is a deficient number, since it is larger than the sum of its proper divisors (16853027).

216711157 is a wasteful number, since it uses less digits than its factorization.

216711157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13079.

The product of its digits is 2940, while the sum is 31.

The square root of 216711157 is about 14721.1126277873. The cubic root of 216711157 is about 600.6577573656.

Adding to 216711157 its reverse (751117612), we get a palindrome (967828769).

The spelling of 216711157 in words is "two hundred sixteen million, seven hundred eleven thousand, one hundred fifty-seven".