140161565 has 4 divisors (see below), whose sum is σ = 168193884. Its totient is φ = 112129248.

The previous prime is 140161559. The next prime is 140161573. The reversal of 140161565 is 565161041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565161041 = 47 ⋅12024703.

It can be written as a sum of positive squares in 2 ways, for example, as 84971524 + 55190041 = 9218^2 + 7429^2 .

It is a cyclic number.

It is not a de Polignac number, because 140161565 - 2¹⁶ = 140096029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 14016152 + ... + 14016161.

It is an arithmetic number, because the mean of its divisors is an integer number (42048471).

Almost surely, 2^140161565 is an apocalyptic number.

It is an amenable number.

140161565 is a deficient number, since it is larger than the sum of its proper divisors (28032319).

140161565 is an equidigital number, since it uses as much as digits as its factorization.

140161565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28032318.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 140161565 is about 11838.9849649368. The cubic root of 140161565 is about 519.4490775184.

The spelling of 140161565 in words is "one hundred forty million, one hundred sixty-one thousand, five hundred sixty-five".