140606309 has 2 divisors, whose sum is σ = 140606310. Its totient is φ = 140606308.

The previous prime is 140606293. The next prime is 140606311. The reversal of 140606309 is 903606041.

140606309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 10144225 = 11422^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 140606309 - 2⁴ = 140606293 is a prime.

Together with 140606311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140606339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70303154 + 70303155.

It is an arithmetic number, because the mean of its divisors is an integer number (70303155).

Almost surely, 2^140606309 is an apocalyptic number.

It is an amenable number.

140606309 is a deficient number, since it is larger than the sum of its proper divisors (1).

140606309 is an equidigital number, since it uses as much as digits as its factorization.

140606309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 140606309 is about 11857.7531176863. The cubic root of 140606309 is about 519.9979154256.

It can be divided in two parts, 14060 and 6309, that multiplied together give a triangular number (88704540 = T₁₃₃₁₉).

The spelling of 140606309 in words is "one hundred forty million, six hundred six thousand, three hundred nine".