140123509 has 2 divisors, whose sum is σ = 140123510. Its totient is φ = 140123508.

The previous prime is 140123491. The next prime is 140123513. The reversal of 140123509 is 905321041.

140123509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 63648484 = 8745^2 + 7978^2 .

It is a cyclic number.

It is not a de Polignac number, because 140123509 - 2¹³ = 140115317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140123519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70061754 + 70061755.

It is an arithmetic number, because the mean of its divisors is an integer number (70061755).

Almost surely, 2^140123509 is an apocalyptic number.

It is an amenable number.

140123509 is a deficient number, since it is larger than the sum of its proper divisors (1).

140123509 is an equidigital number, since it uses as much as digits as its factorization.

140123509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 140123509 is about 11837.3776234435. The cubic root of 140123509 is about 519.4020604837.

The spelling of 140123509 in words is "one hundred forty million, one hundred twenty-three thousand, five hundred nine".