140205521 has 2 divisors, whose sum is σ = 140205522. Its totient is φ = 140205520.

The previous prime is 140205497. The next prime is 140205551. The reversal of 140205521 is 125502041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123099025 + 17106496 = 11095^2 + 4136^2 .

It is a cyclic number.

It is not a de Polignac number, because 140205521 - 2²² = 136011217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 140205493 and 140205502.

It is not a weakly prime, because it can be changed into another prime (140205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70102760 + 70102761.

It is an arithmetic number, because the mean of its divisors is an integer number (70102761).

Almost surely, 2^140205521 is an apocalyptic number.

It is an amenable number.

140205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

140205521 is an equidigital number, since it uses as much as digits as its factorization.

140205521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 140205521 is about 11840.8412285614. The cubic root of 140205521 is about 519.5033732335.

Adding to 140205521 its reverse (125502041), we get a palindrome (265707562).

The spelling of 140205521 in words is "one hundred forty million, two hundred five thousand, five hundred twenty-one".