140206081 has 2 divisors, whose sum is σ = 140206082. Its totient is φ = 140206080.

The previous prime is 140206069. The next prime is 140206127. The reversal of 140206081 is 180602041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90630400 + 49575681 = 9520^2 + 7041^2 .

It is an emirp because it is prime and its reverse (180602041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140206081 - 2¹¹ = 140204033 is a prime.

It is a super-2 number, since 2×140206081² = 39315490298757122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140201081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70103040 + 70103041.

It is an arithmetic number, because the mean of its divisors is an integer number (70103041).

Almost surely, 2^140206081 is an apocalyptic number.

It is an amenable number.

140206081 is a deficient number, since it is larger than the sum of its proper divisors (1).

140206081 is an equidigital number, since it uses as much as digits as its factorization.

140206081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 140206081 is about 11840.8648755063. The cubic root of 140206081 is about 519.5040648883.

The spelling of 140206081 in words is "one hundred forty million, two hundred six thousand, eighty-one".