212794909 has 2 divisors, whose sum is σ = 212794910. Its totient is φ = 212794908.

The previous prime is 212794877. The next prime is 212794931. The reversal of 212794909 is 909497212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 29192409 = 13550^2 + 5403^2 .

It is a cyclic number.

It is not a de Polignac number, because 212794909 - 2⁵ = 212794877 is a prime.

It is a super-3 number, since 3×212794909³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212794949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106397454 + 106397455.

It is an arithmetic number, because the mean of its divisors is an integer number (106397455).

Almost surely, 2^212794909 is an apocalyptic number.

It is an amenable number.

212794909 is a deficient number, since it is larger than the sum of its proper divisors (1).

212794909 is an equidigital number, since it uses as much as digits as its factorization.

212794909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 212794909 is about 14587.4915252760. The cubic root of 212794909 is about 597.0175224252.

The spelling of 212794909 in words is "two hundred twelve million, seven hundred ninety-four thousand, nine hundred nine".