212913893 has 2 divisors, whose sum is σ = 212913894. Its totient is φ = 212913892.

The previous prime is 212913887. The next prime is 212913923. The reversal of 212913893 is 398319212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177475684 + 35438209 = 13322^2 + 5953^2 .

It is a cyclic number.

It is not a de Polignac number, because 212913893 - 2¹² = 212909797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212913793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106456946 + 106456947.

It is an arithmetic number, because the mean of its divisors is an integer number (106456947).

Almost surely, 2^212913893 is an apocalyptic number.

It is an amenable number.

212913893 is a deficient number, since it is larger than the sum of its proper divisors (1).

212913893 is an equidigital number, since it uses as much as digits as its factorization.

212913893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 212913893 is about 14591.5692439162. The cubic root of 212913893 is about 597.1287755523.

The spelling of 212913893 in words is "two hundred twelve million, nine hundred thirteen thousand, eight hundred ninety-three".