140218909 has 2 divisors, whose sum is σ = 140218910. Its totient is φ = 140218908.

The previous prime is 140218901. The next prime is 140218951. The reversal of 140218909 is 909812041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 38713284 = 10075^2 + 6222^2 .

It is a cyclic number.

It is not a de Polignac number, because 140218909 - 2³ = 140218901 is a prime.

It is a super-2 number, since 2×140218909² = 39322684882300562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140218901) 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, 70109454 + 70109455.

It is an arithmetic number, because the mean of its divisors is an integer number (70109455).

Almost surely, 2^140218909 is an apocalyptic number.

It is an amenable number.

140218909 is a deficient number, since it is larger than the sum of its proper divisors (1).

140218909 is an equidigital number, since it uses as much as digits as its factorization.

140218909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 140218909 is about 11841.4065465214. The cubic root of 140218909 is about 519.5199082214.

The spelling of 140218909 in words is "one hundred forty million, two hundred eighteen thousand, nine hundred nine".