140213561 has 2 divisors, whose sum is σ = 140213562. Its totient is φ = 140213560.

The previous prime is 140213551. The next prime is 140213599. The reversal of 140213561 is 165312041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 20529961 = 10940^2 + 4531^2 .

It is a cyclic number.

It is not a de Polignac number, because 140213561 - 2¹⁴ = 140197177 is a prime.

It is not a weakly prime, because it can be changed into another prime (140213551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70106780 + 70106781.

It is an arithmetic number, because the mean of its divisors is an integer number (70106781).

Almost surely, 2^140213561 is an apocalyptic number.

It is an amenable number.

140213561 is a deficient number, since it is larger than the sum of its proper divisors (1).

140213561 is an equidigital number, since it uses as much as digits as its factorization.

140213561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 140213561 is about 11841.1807265999. The cubic root of 140213561 is about 519.5133032449.

The spelling of 140213561 in words is "one hundred forty million, two hundred thirteen thousand, five hundred sixty-one".