140262509 has 2 divisors, whose sum is σ = 140262510. Its totient is φ = 140262508.

The previous prime is 140262469. The next prime is 140262581. The reversal of 140262509 is 905262041.

It is a happy number.

140262509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99940009 + 40322500 = 9997^2 + 6350^2 .

It is an emirp because it is prime and its reverse (905262041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140262509 - 2⁸ = 140262253 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (140265509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70131254 + 70131255.

It is an arithmetic number, because the mean of its divisors is an integer number (70131255).

Almost surely, 2^140262509 is an apocalyptic number.

It is an amenable number.

140262509 is a deficient number, since it is larger than the sum of its proper divisors (1).

140262509 is an equidigital number, since it uses as much as digits as its factorization.

140262509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 140262509 is about 11843.2474009454. The cubic root of 140262509 is about 519.5737495586.

The spelling of 140262509 in words is "one hundred forty million, two hundred sixty-two thousand, five hundred nine".