212343457 has 2 divisors, whose sum is σ = 212343458. Its totient is φ = 212343456.

The previous prime is 212343433. The next prime is 212343473. The reversal of 212343457 is 754343212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140280336 + 72063121 = 11844^2 + 8489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212343457 is a prime.

It is not a weakly prime, because it can be changed into another prime (212343497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106171728 + 106171729.

It is an arithmetic number, because the mean of its divisors is an integer number (106171729).

Almost surely, 2^212343457 is an apocalyptic number.

It is an amenable number.

212343457 is a deficient number, since it is larger than the sum of its proper divisors (1).

212343457 is an equidigital number, since it uses as much as digits as its factorization.

212343457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 31.

The square root of 212343457 is about 14572.0093672767. The cubic root of 212343457 is about 596.5950255041.

Adding to 212343457 its reverse (754343212), we get a palindrome (966686669).

The spelling of 212343457 in words is "two hundred twelve million, three hundred forty-three thousand, four hundred fifty-seven".