216313172 has 6 divisors (see below), whose sum is σ = 378548058. Its totient is φ = 108156584.

The previous prime is 216313127. The next prime is 216313217. The reversal of 216313172 is 271313612.

216313172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216313127) and next prime (216313217).

It can be written as a sum of positive squares in only one way, i.e., 207763396 + 8549776 = 14414^2 + 2924^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27039143 + ... + 27039150.

It is an arithmetic number, because the mean of its divisors is an integer number (63091343).

Almost surely, 2^216313172 is an apocalyptic number.

It is an amenable number.

216313172 is a deficient number, since it is larger than the sum of its proper divisors (162234886).

216313172 is a wasteful number, since it uses less digits than its factorization.

216313172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54078297 (or 54078295 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 216313172 is about 14707.5889254493. The cubic root of 216313172 is about 600.2898340452.

Adding to 216313172 its reverse (271313612), we get a palindrome (487626784).

The spelling of 216313172 in words is "two hundred sixteen million, three hundred thirteen thousand, one hundred seventy-two".