140561 has 4 divisors (see below), whose sum is σ = 141312. Its totient is φ = 139812.

The previous prime is 140557. The next prime is 140587. The reversal of 140561 is 165041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 140561 - 2² = 140557 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 140561.

It is not an unprimeable number, because it can be changed into a prime (140521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (35328).

2¹⁴⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

140561 is a deficient number, since it is larger than the sum of its proper divisors (751).

140561 is an equidigital number, since it uses as much as digits as its factorization.

140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 140561 is about 374.9146569554. The cubic root of 140561 is about 51.9942054687.

The spelling of 140561 in words is "one hundred forty thousand, five hundred sixty-one".