140420561 has 4 divisors (see below), whose sum is σ = 148680612. Its totient is φ = 132160512.

The previous prime is 140420509. The next prime is 140420563. The reversal of 140420561 is 165024041.

140420561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86118400 + 54302161 = 9280^2 + 7369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140420561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140420563) 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, 4130000 + ... + 4130033.

It is an arithmetic number, because the mean of its divisors is an integer number (37170153).

Almost surely, 2^140420561 is an apocalyptic number.

It is an amenable number.

140420561 is a deficient number, since it is larger than the sum of its proper divisors (8260051).

140420561 is an equidigital number, since it uses as much as digits as its factorization.

140420561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260050.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 140420561 is about 11849.9181853716. The cubic root of 140420561 is about 519.7688333938.

The spelling of 140420561 in words is "one hundred forty million, four hundred twenty thousand, five hundred sixty-one".