140564909 has 4 divisors (see below), whose sum is σ = 142144380. Its totient is φ = 138985440.

The previous prime is 140564867. The next prime is 140564929. The reversal of 140564909 is 909465041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94284100 + 46280809 = 9710^2 + 6803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140564909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140564929) 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 in 3 ways as a sum of consecutive naturals, for example, 789602 + ... + 789779.

It is an arithmetic number, because the mean of its divisors is an integer number (35536095).

Almost surely, 2^140564909 is an apocalyptic number.

It is an amenable number.

140564909 is a deficient number, since it is larger than the sum of its proper divisors (1579471).

140564909 is an equidigital number, since it uses as much as digits as its factorization.

140564909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579470.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 140564909 is about 11856.0072958817. The cubic root of 140564909 is about 519.9468745036.

The spelling of 140564909 in words is "one hundred forty million, five hundred sixty-four thousand, nine hundred nine".