140056561 has 2 divisors, whose sum is σ = 140056562. Its totient is φ = 140056560.

The previous prime is 140056537. The next prime is 140056583. The reversal of 140056561 is 165650041.

140056561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126697536 + 13359025 = 11256^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 140056561 - 2⁵ = 140056529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140056531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70028280 + 70028281.

It is an arithmetic number, because the mean of its divisors is an integer number (70028281).

Almost surely, 2^140056561 is an apocalyptic number.

It is an amenable number.

140056561 is a deficient number, since it is larger than the sum of its proper divisors (1).

140056561 is an equidigital number, since it uses as much as digits as its factorization.

140056561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 140056561 is about 11834.5494633298. The cubic root of 140056561 is about 519.3193275938.

The spelling of 140056561 in words is "one hundred forty million, fifty-six thousand, five hundred sixty-one".