140252809 has 2 divisors, whose sum is σ = 140252810. Its totient is φ = 140252808.

The previous prime is 140252789. The next prime is 140252821. The reversal of 140252809 is 908252041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125507209 + 14745600 = 11203^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 140252809 - 2²¹ = 138155657 is a prime.

It is a super-3 number, since 3×140252809³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140252869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70126404 + 70126405.

It is an arithmetic number, because the mean of its divisors is an integer number (70126405).

Almost surely, 2^140252809 is an apocalyptic number.

It is an amenable number.

140252809 is a deficient number, since it is larger than the sum of its proper divisors (1).

140252809 is an equidigital number, since it uses as much as digits as its factorization.

140252809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 140252809 is about 11842.8378778061. The cubic root of 140252809 is about 519.5617720611.

The spelling of 140252809 in words is "one hundred forty million, two hundred fifty-two thousand, eight hundred nine".