123902609 has 2 divisors, whose sum is σ = 123902610. Its totient is φ = 123902608.

The previous prime is 123902599. The next prime is 123902617. The reversal of 123902609 is 906209321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123832384 + 70225 = 11128^2 + 265^2 .

It is an emirp because it is prime and its reverse (906209321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123902609 - 2¹² = 123898513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (123902689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61951304 + 61951305.

It is an arithmetic number, because the mean of its divisors is an integer number (61951305).

Almost surely, 2^123902609 is an apocalyptic number.

It is an amenable number.

123902609 is a deficient number, since it is larger than the sum of its proper divisors (1).

123902609 is an equidigital number, since it uses as much as digits as its factorization.

123902609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 123902609 is about 11131.1548816823. The cubic root of 123902609 is about 498.5325091550.

The spelling of 123902609 in words is "one hundred twenty-three million, nine hundred two thousand, six hundred nine".