212798779 has 2 divisors, whose sum is σ = 212798780. Its totient is φ = 212798778.

The previous prime is 212798759. The next prime is 212798797. The reversal of 212798779 is 977897212.

Together with next prime (212798797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212798779 is a prime.

It is not a weakly prime, because it can be changed into another prime (212798759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106399389 + 106399390.

It is an arithmetic number, because the mean of its divisors is an integer number (106399390).

Almost surely, 2^212798779 is an apocalyptic number.

212798779 is a deficient number, since it is larger than the sum of its proper divisors (1).

212798779 is an equidigital number, since it uses as much as digits as its factorization.

212798779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 212798779 is about 14587.6241725649. The cubic root of 212798779 is about 597.0211416280.

The spelling of 212798779 in words is "two hundred twelve million, seven hundred ninety-eight thousand, seven hundred seventy-nine".