212782397 has 2 divisors, whose sum is σ = 212782398. Its totient is φ = 212782396.

The previous prime is 212782373. The next prime is 212782411. The reversal of 212782397 is 793287212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189172516 + 23609881 = 13754^2 + 4859^2 .

It is a cyclic number.

It is not a de Polignac number, because 212782397 - 2¹² = 212778301 is a prime.

It is equal to p_11746589 and since 212782397 and 11746589 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212782327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106391198 + 106391199.

It is an arithmetic number, because the mean of its divisors is an integer number (106391199).

Almost surely, 2^212782397 is an apocalyptic number.

It is an amenable number.

212782397 is a deficient number, since it is larger than the sum of its proper divisors (1).

212782397 is an equidigital number, since it uses as much as digits as its factorization.

212782397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 212782397 is about 14587.0626583970. The cubic root of 212782397 is about 597.0058209710.

The spelling of 212782397 in words is "two hundred twelve million, seven hundred eighty-two thousand, three hundred ninety-seven".