212257693 has 2 divisors, whose sum is σ = 212257694. Its totient is φ = 212257692.

The previous prime is 212257681. The next prime is 212257709. The reversal of 212257693 is 396752212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165431044 + 46826649 = 12862^2 + 6843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212257693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212257603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106128846 + 106128847.

It is an arithmetic number, because the mean of its divisors is an integer number (106128847).

Almost surely, 2^212257693 is an apocalyptic number.

It is an amenable number.

212257693 is a deficient number, since it is larger than the sum of its proper divisors (1).

212257693 is an equidigital number, since it uses as much as digits as its factorization.

212257693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 212257693 is about 14569.0663050176. The cubic root of 212257693 is about 596.5146945368.

The spelling of 212257693 in words is "two hundred twelve million, two hundred fifty-seven thousand, six hundred ninety-three".