1012120309 has 2 divisors, whose sum is σ = 1012120310. Its totient is φ = 1012120308.

The previous prime is 1012120289. The next prime is 1012120331. The reversal of 1012120309 is 9030212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941139684 + 70980625 = 30678^2 + 8425^2 .

It is an emirp because it is prime and its reverse (9030212101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012120309 - 2⁷ = 1012120181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012120339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506060154 + 506060155.

It is an arithmetic number, because the mean of its divisors is an integer number (506060155).

Almost surely, 2^1012120309 is an apocalyptic number.

It is an amenable number.

1012120309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012120309 is an equidigital number, since it uses as much as digits as its factorization.

1012120309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1012120309 is about 31813.8383254835. The cubic root of 1012120309 is about 1004.0238895947.

The spelling of 1012120309 in words is "one billion, twelve million, one hundred twenty thousand, three hundred nine".