140243549 has 2 divisors, whose sum is σ = 140243550. Its totient is φ = 140243548.

The previous prime is 140243497. The next prime is 140243563. The reversal of 140243549 is 945342041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 1428025 = 11782^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 140243549 - 2¹² = 140239453 is a prime.

It is a super-2 number, since 2×140243549² = 39336506072230802, which contains 22 as substring.

It is equal to p_7925153 and since 140243549 and 7925153 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140243599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70121774 + 70121775.

It is an arithmetic number, because the mean of its divisors is an integer number (70121775).

Almost surely, 2^140243549 is an apocalyptic number.

It is an amenable number.

140243549 is a deficient number, since it is larger than the sum of its proper divisors (1).

140243549 is an equidigital number, since it uses as much as digits as its factorization.

140243549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 140243549 is about 11842.4469177615. The cubic root of 140243549 is about 519.5503373575.

The spelling of 140243549 in words is "one hundred forty million, two hundred forty-three thousand, five hundred forty-nine".