212770813 has 2 divisors, whose sum is σ = 212770814. Its totient is φ = 212770812.

The previous prime is 212770807. The next prime is 212770841. The reversal of 212770813 is 318077212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197065444 + 15705369 = 14038^2 + 3963^2 .

It is a cyclic number.

It is not a de Polignac number, because 212770813 - 2⁵ = 212770781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212770213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106385406 + 106385407.

It is an arithmetic number, because the mean of its divisors is an integer number (106385407).

Almost surely, 2^212770813 is an apocalyptic number.

It is an amenable number.

212770813 is a deficient number, since it is larger than the sum of its proper divisors (1).

212770813 is an equidigital number, since it uses as much as digits as its factorization.

212770813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 212770813 is about 14586.6655888178. The cubic root of 212770813 is about 596.9949869906.

The spelling of 212770813 in words is "two hundred twelve million, seven hundred seventy thousand, eight hundred thirteen".