211531316 has 6 divisors (see below), whose sum is σ = 370179810. Its totient is φ = 105765656.

The previous prime is 211531291. The next prime is 211531337. The reversal of 211531316 is 613135112.

It can be written as a sum of positive squares in only one way, i.e., 211411600 + 119716 = 14540^2 + 346^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211531291 and 211531300.

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, 26441411 + ... + 26441418.

It is an arithmetic number, because the mean of its divisors is an integer number (61696635).

Almost surely, 2^211531316 is an apocalyptic number.

It is an amenable number.

211531316 is a deficient number, since it is larger than the sum of its proper divisors (158648494).

211531316 is a wasteful number, since it uses less digits than its factorization.

211531316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52882833 (or 52882831 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 211531316 is about 14544.1161986557. The cubic root of 211531316 is about 595.8334632218.

Adding to 211531316 its reverse (613135112), we get a palindrome (824666428).

The spelling of 211531316 in words is "two hundred eleven million, five hundred thirty-one thousand, three hundred sixteen".