140969581 has 2 divisors, whose sum is σ = 140969582. Its totient is φ = 140969580.

The previous prime is 140969561. The next prime is 140969623. The reversal of 140969581 is 185969041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 59428681 = 9030^2 + 7709^2 .

It is a cyclic number.

It is not a de Polignac number, because 140969581 - 2⁹ = 140969069 is a prime.

It is a super-2 number, since 2×140969581² = 39744845534631122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140969501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70484790 + 70484791.

It is an arithmetic number, because the mean of its divisors is an integer number (70484791).

Almost surely, 2^140969581 is an apocalyptic number.

It is an amenable number.

140969581 is a deficient number, since it is larger than the sum of its proper divisors (1).

140969581 is an equidigital number, since it uses as much as digits as its factorization.

140969581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 140969581 is about 11873.0611469831. The cubic root of 140969581 is about 520.4453544137.

The spelling of 140969581 in words is "one hundred forty million, nine hundred sixty-nine thousand, five hundred eighty-one".