212245457 has 2 divisors, whose sum is σ = 212245458. Its totient is φ = 212245456.

The previous prime is 212245417. The next prime is 212245507. The reversal of 212245457 is 754542212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173817856 + 38427601 = 13184^2 + 6199^2 .

It is a cyclic number.

It is not a de Polignac number, because 212245457 - 2²² = 208051153 is a prime.

It is not a weakly prime, because it can be changed into another prime (212245417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106122728 + 106122729.

It is an arithmetic number, because the mean of its divisors is an integer number (106122729).

Almost surely, 2^212245457 is an apocalyptic number.

It is an amenable number.

212245457 is a deficient number, since it is larger than the sum of its proper divisors (1).

212245457 is an equidigital number, since it uses as much as digits as its factorization.

212245457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 32.

The square root of 212245457 is about 14568.6463681428. The cubic root of 212245457 is about 596.5032319070.

Adding to 212245457 its reverse (754542212), we get a palindrome (966787669).

The spelling of 212245457 in words is "two hundred twelve million, two hundred forty-five thousand, four hundred fifty-seven".