211431313 has 2 divisors, whose sum is σ = 211431314. Its totient is φ = 211431312.

The previous prime is 211431247. The next prime is 211431317. The reversal of 211431313 is 313134112.

211431313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 14085009 = 14048^2 + 3753^2 .

It is a cyclic number.

It is not a de Polignac number, because 211431313 - 2²¹ = 209334161 is a prime.

It is not a weakly prime, because it can be changed into another prime (211431317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105715656 + 105715657.

It is an arithmetic number, because the mean of its divisors is an integer number (105715657).

Almost surely, 2^211431313 is an apocalyptic number.

It is an amenable number.

211431313 is a deficient number, since it is larger than the sum of its proper divisors (1).

211431313 is an equidigital number, since it uses as much as digits as its factorization.

211431313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 211431313 is about 14540.6778727816. The cubic root of 211431313 is about 595.7395535237.

Adding to 211431313 its reverse (313134112), we get a palindrome (524565425).

The spelling of 211431313 in words is "two hundred eleven million, four hundred thirty-one thousand, three hundred thirteen".