212178523 has 2 divisors, whose sum is σ = 212178524. Its totient is φ = 212178522.

The previous prime is 212178521. The next prime is 212178563. The reversal of 212178523 is 325871212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212178523 - 2¹ = 212178521 is a prime.

Together with 212178521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212178521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106089261 + 106089262.

It is an arithmetic number, because the mean of its divisors is an integer number (106089262).

Almost surely, 2^212178523 is an apocalyptic number.

212178523 is a deficient number, since it is larger than the sum of its proper divisors (1).

212178523 is an equidigital number, since it uses as much as digits as its factorization.

212178523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 212178523 is about 14566.3489934849. The cubic root of 212178523 is about 596.4405206391.

The spelling of 212178523 in words is "two hundred twelve million, one hundred seventy-eight thousand, five hundred twenty-three".