247138369909 has 2 divisors, whose sum is σ = 247138369910. Its totient is φ = 247138369908.

The previous prime is 247138369901. The next prime is 247138369967. The reversal of 247138369909 is 909963831742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208937667409 + 38200702500 = 457097^2 + 195450^2 .

It is a cyclic number.

It is not a de Polignac number, because 247138369909 - 2³ = 247138369901 is a prime.

It is a super-2 number, since 2×247138369909² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247138369901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123569184954 + 123569184955.

It is an arithmetic number, because the mean of its divisors is an integer number (123569184955).

Almost surely, 2^247138369909 is an apocalyptic number.

It is an amenable number.

247138369909 is a deficient number, since it is larger than the sum of its proper divisors (1).

247138369909 is an equidigital number, since it uses as much as digits as its factorization.

247138369909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 247138369909 in words is "two hundred forty-seven billion, one hundred thirty-eight million, three hundred sixty-nine thousand, nine hundred nine".