212905877 has 2 divisors, whose sum is σ = 212905878. Its totient is φ = 212905876.

The previous prime is 212905843. The next prime is 212905933. The reversal of 212905877 is 778509212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178730161 + 34175716 = 13369^2 + 5846^2 .

It is a cyclic number.

It is not a de Polignac number, because 212905877 - 2¹² = 212901781 is a prime.

It is a super-2 number, since 2×212905877² = 90657824922278258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212905837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106452938 + 106452939.

It is an arithmetic number, because the mean of its divisors is an integer number (106452939).

Almost surely, 2^212905877 is an apocalyptic number.

It is an amenable number.

212905877 is a deficient number, since it is larger than the sum of its proper divisors (1).

212905877 is an equidigital number, since it uses as much as digits as its factorization.

212905877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 212905877 is about 14591.2945621696. The cubic root of 212905877 is about 597.1212816866.

The spelling of 212905877 in words is "two hundred twelve million, nine hundred five thousand, eight hundred seventy-seven".