140557909 has 2 divisors, whose sum is σ = 140557910. Its totient is φ = 140557908.

The previous prime is 140557873. The next prime is 140557913. The reversal of 140557909 is 909755041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73153809 + 67404100 = 8553^2 + 8210^2 .

It is a cyclic number.

It is not a de Polignac number, because 140557909 - 2¹¹ = 140555861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140557009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70278954 + 70278955.

It is an arithmetic number, because the mean of its divisors is an integer number (70278955).

Almost surely, 2^140557909 is an apocalyptic number.

It is an amenable number.

140557909 is a deficient number, since it is larger than the sum of its proper divisors (1).

140557909 is an equidigital number, since it uses as much as digits as its factorization.

140557909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 140557909 is about 11855.7120832112. The cubic root of 140557909 is about 519.9382434056.

The spelling of 140557909 in words is "one hundred forty million, five hundred fifty-seven thousand, nine hundred nine".