140221309 has 2 divisors, whose sum is σ = 140221310. Its totient is φ = 140221308.

The previous prime is 140221307. The next prime is 140221397. The reversal of 140221309 is 903122041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104101209 + 36120100 = 10203^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 140221309 - 2¹ = 140221307 is a prime.

Together with 140221307, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 140221309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140221307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70110654 + 70110655.

It is an arithmetic number, because the mean of its divisors is an integer number (70110655).

Almost surely, 2^140221309 is an apocalyptic number.

It is an amenable number.

140221309 is a deficient number, since it is larger than the sum of its proper divisors (1).

140221309 is an equidigital number, since it uses as much as digits as its factorization.

140221309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 140221309 is about 11841.5078854004. The cubic root of 140221309 is about 519.5228722550.

The spelling of 140221309 in words is "one hundred forty million, two hundred twenty-one thousand, three hundred nine".