212878297 has 4 divisors (see below), whose sum is σ = 212910516. Its totient is φ = 212846080.

The previous prime is 212878291. The next prime is 212878321. The reversal of 212878297 is 792878212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126090441 + 86787856 = 11229^2 + 9316^2 .

It is a cyclic number.

It is not a de Polignac number, because 212878297 - 2²³ = 204489689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212878291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188 + ... + 20749.

It is an arithmetic number, because the mean of its divisors is an integer number (53227629).

Almost surely, 2^212878297 is an apocalyptic number.

It is an amenable number.

212878297 is a deficient number, since it is larger than the sum of its proper divisors (32219).

212878297 is an equidigital number, since it uses as much as digits as its factorization.

212878297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32218.

The product of its digits is 225792, while the sum is 46.

The square root of 212878297 is about 14590.3494474944. The cubic root of 212878297 is about 597.0954967148.

It can be divided in two parts, 21287 and 8297, that added together give a square (29584 = 172²).

The spelling of 212878297 in words is "two hundred twelve million, eight hundred seventy-eight thousand, two hundred ninety-seven".