140940809 has 2 divisors, whose sum is σ = 140940810. Its totient is φ = 140940808.

The previous prime is 140940797. The next prime is 140940817. The reversal of 140940809 is 908049041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 32718400 = 10403^2 + 5720^2 .

It is an emirp because it is prime and its reverse (908049041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140940809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140940869) 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, 70470404 + 70470405.

It is an arithmetic number, because the mean of its divisors is an integer number (70470405).

Almost surely, 2^140940809 is an apocalyptic number.

It is an amenable number.

140940809 is a deficient number, since it is larger than the sum of its proper divisors (1).

140940809 is an equidigital number, since it uses as much as digits as its factorization.

140940809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 140940809 is about 11871.8494346921. The cubic root of 140940809 is about 520.4099442387.

The spelling of 140940809 in words is "one hundred forty million, nine hundred forty thousand, eight hundred nine".