212009129 has 2 divisors, whose sum is σ = 212009130. Its totient is φ = 212009128.

The previous prime is 212009113. The next prime is 212009137. The reversal of 212009129 is 921900212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211411600 + 597529 = 14540^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 212009129 - 2⁴ = 212009113 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212009098 and 212009107.

It is not a weakly prime, because it can be changed into another prime (212009179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106004564 + 106004565.

It is an arithmetic number, because the mean of its divisors is an integer number (106004565).

Almost surely, 2^212009129 is an apocalyptic number.

It is an amenable number.

212009129 is a deficient number, since it is larger than the sum of its proper divisors (1).

212009129 is an equidigital number, since it uses as much as digits as its factorization.

212009129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 212009129 is about 14560.5332663333. The cubic root of 212009129 is about 596.2817544220.

The spelling of 212009129 in words is "two hundred twelve million, nine thousand, one hundred twenty-nine".