140105561 has 2 divisors, whose sum is σ = 140105562. Its totient is φ = 140105560.

The previous prime is 140105557. The next prime is 140105579. The reversal of 140105561 is 165501041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 18113536 = 11045^2 + 4256^2 .

It is an emirp because it is prime and its reverse (165501041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140105561 - 2² = 140105557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (140105521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70052780 + 70052781.

It is an arithmetic number, because the mean of its divisors is an integer number (70052781).

Almost surely, 2^140105561 is an apocalyptic number.

It is an amenable number.

140105561 is a deficient number, since it is larger than the sum of its proper divisors (1).

140105561 is an equidigital number, since it uses as much as digits as its factorization.

140105561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 140105561 is about 11836.6194920678. The cubic root of 140105561 is about 519.3798833194.

The spelling of 140105561 in words is "one hundred forty million, one hundred five thousand, five hundred sixty-one".