140820509 has 2 divisors, whose sum is σ = 140820510. Its totient is φ = 140820508.

The previous prime is 140820499. The next prime is 140820583. The reversal of 140820509 is 905028041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124255609 + 16564900 = 11147^2 + 4070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140820509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140820599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70410254 + 70410255.

It is an arithmetic number, because the mean of its divisors is an integer number (70410255).

Almost surely, 2^140820509 is an apocalyptic number.

It is an amenable number.

140820509 is a deficient number, since it is larger than the sum of its proper divisors (1).

140820509 is an equidigital number, since it uses as much as digits as its factorization.

140820509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 140820509 is about 11866.7817456967. The cubic root of 140820509 is about 520.2618368229.

The spelling of 140820509 in words is "one hundred forty million, eight hundred twenty thousand, five hundred nine".