140540009 has 2 divisors, whose sum is σ = 140540010. Its totient is φ = 140540008.

The previous prime is 140539951. The next prime is 140540033. The reversal of 140540009 is 900045041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132894784 + 7645225 = 11528^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 140540009 - 2⁸ = 140539753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140540069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70270004 + 70270005.

It is an arithmetic number, because the mean of its divisors is an integer number (70270005).

Almost surely, 2^140540009 is an apocalyptic number.

It is an amenable number.

140540009 is a deficient number, since it is larger than the sum of its proper divisors (1).

140540009 is an equidigital number, since it uses as much as digits as its factorization.

140540009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 140540009 is about 11854.9571488049. The cubic root of 140540009 is about 519.9161711514.

It can be divided in two parts, 1405 and 40009, that added together give a palindrome (41414).

The spelling of 140540009 in words is "one hundred forty million, five hundred forty thousand, nine".