140199809 has 2 divisors, whose sum is σ = 140199810. Its totient is φ = 140199808.

The previous prime is 140199779. The next prime is 140199811. The reversal of 140199809 is 908991041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89718784 + 50481025 = 9472^2 + 7105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140199809 is a prime.

Together with 140199811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140199889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70099904 + 70099905.

It is an arithmetic number, because the mean of its divisors is an integer number (70099905).

Almost surely, 2^140199809 is an apocalyptic number.

It is an amenable number.

140199809 is a deficient number, since it is larger than the sum of its proper divisors (1).

140199809 is an equidigital number, since it uses as much as digits as its factorization.

140199809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 140199809 is about 11840.6000270257. The cubic root of 140199809 is about 519.4963182484.

The spelling of 140199809 in words is "one hundred forty million, one hundred ninety-nine thousand, eight hundred nine".