140260661 has 2 divisors, whose sum is σ = 140260662. Its totient is φ = 140260660.

The previous prime is 140260639. The next prime is 140260663. The reversal of 140260661 is 166062041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133980625 + 6280036 = 11575^2 + 2506^2 .

It is an emirp because it is prime and its reverse (166062041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140260661 - 2⁶ = 140260597 is a prime.

Together with 140260663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140260661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140260663) 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, 70130330 + 70130331.

It is an arithmetic number, because the mean of its divisors is an integer number (70130331).

Almost surely, 2^140260661 is an apocalyptic number.

It is an amenable number.

140260661 is a deficient number, since it is larger than the sum of its proper divisors (1).

140260661 is an equidigital number, since it uses as much as digits as its factorization.

140260661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 140260661 is about 11843.1693815465. The cubic root of 140260661 is about 519.5714677027.

The spelling of 140260661 in words is "one hundred forty million, two hundred sixty thousand, six hundred sixty-one".