212831393 has 2 divisors, whose sum is σ = 212831394. Its totient is φ = 212831392.

The previous prime is 212831387. The next prime is 212831401. The reversal of 212831393 is 393138212.

212831393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197908624 + 14922769 = 14068^2 + 3863^2 .

It is a cyclic number.

It is not a de Polignac number, because 212831393 - 2⁸ = 212831137 is a prime.

It is not a weakly prime, because it can be changed into another prime (212831323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106415696 + 106415697.

It is an arithmetic number, because the mean of its divisors is an integer number (106415697).

Almost surely, 2^212831393 is an apocalyptic number.

It is an amenable number.

212831393 is a deficient number, since it is larger than the sum of its proper divisors (1).

212831393 is an equidigital number, since it uses as much as digits as its factorization.

212831393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 212831393 is about 14588.7419951139. The cubic root of 212831393 is about 597.0516403194.

The spelling of 212831393 in words is "two hundred twelve million, eight hundred thirty-one thousand, three hundred ninety-three".