212094781 has 2 divisors, whose sum is σ = 212094782. Its totient is φ = 212094780.

The previous prime is 212094761. The next prime is 212094787. The reversal of 212094781 is 187490212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164608900 + 47485881 = 12830^2 + 6891^2 .

It is a cyclic number.

It is not a de Polignac number, because 212094781 - 2⁹ = 212094269 is a prime.

It is a super-2 number, since 2×212094781² = 89968392254875922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212094787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106047390 + 106047391.

It is an arithmetic number, because the mean of its divisors is an integer number (106047391).

Almost surely, 2^212094781 is an apocalyptic number.

It is an amenable number.

212094781 is a deficient number, since it is larger than the sum of its proper divisors (1).

212094781 is an equidigital number, since it uses as much as digits as its factorization.

212094781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 212094781 is about 14563.4742077569. The cubic root of 212094781 is about 596.3620431793.

The spelling of 212094781 in words is "two hundred twelve million, ninety-four thousand, seven hundred eighty-one".