140813909 has 2 divisors, whose sum is σ = 140813910. Its totient is φ = 140813908.

The previous prime is 140813903. The next prime is 140813929. The reversal of 140813909 is 909318041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 58094884 = 9095^2 + 7622^2 .

It is a cyclic number.

It is not a de Polignac number, because 140813909 - 2⁸ = 140813653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140813903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70406954 + 70406955.

It is an arithmetic number, because the mean of its divisors is an integer number (70406955).

Almost surely, 2^140813909 is an apocalyptic number.

It is an amenable number.

140813909 is a deficient number, since it is larger than the sum of its proper divisors (1).

140813909 is an equidigital number, since it uses as much as digits as its factorization.

140813909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 140813909 is about 11866.5036552474. The cubic root of 140813909 is about 520.2537087887.

The spelling of 140813909 in words is "one hundred forty million, eight hundred thirteen thousand, nine hundred nine".