140781191 has 2 divisors, whose sum is σ = 140781192. Its totient is φ = 140781190.

The previous prime is 140781187. The next prime is 140781209. The reversal of 140781191 is 191187041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140781191 - 2² = 140781187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140781101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70390595 + 70390596.

It is an arithmetic number, because the mean of its divisors is an integer number (70390596).

Almost surely, 2^140781191 is an apocalyptic number.

140781191 is a deficient number, since it is larger than the sum of its proper divisors (1).

140781191 is an equidigital number, since it uses as much as digits as its factorization.

140781191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 140781191 is about 11865.1249888065. The cubic root of 140781191 is about 520.2134121554.

The spelling of 140781191 in words is "one hundred forty million, seven hundred eighty-one thousand, one hundred ninety-one".