12346989509 has 2 divisors, whose sum is σ = 12346989510. Its totient is φ = 12346989508.

The previous prime is 12346989463. The next prime is 12346989547. The reversal of 12346989509 is 90598964321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11416922500 + 930067009 = 106850^2 + 30497^2 .

It is a cyclic number.

It is not a de Polignac number, because 12346989509 - 2¹⁶ = 12346923973 is a prime.

It is a super-2 number, since 2×12346989509² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12346989709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6173494754 + 6173494755.

It is an arithmetic number, because the mean of its divisors is an integer number (6173494755).

Almost surely, 2^12346989509 is an apocalyptic number.

It is an amenable number.

12346989509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12346989509 is an equidigital number, since it uses as much as digits as its factorization.

12346989509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 12346989509 in words is "twelve billion, three hundred forty-six million, nine hundred eighty-nine thousand, five hundred nine".