140138891 has 2 divisors, whose sum is σ = 140138892. Its totient is φ = 140138890.

The previous prime is 140138857. The next prime is 140138893. The reversal of 140138891 is 198831041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140138891 is a prime.

It is a Sophie Germain prime.

Together with 140138893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140138893) 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, 70069445 + 70069446.

It is an arithmetic number, because the mean of its divisors is an integer number (70069446).

Almost surely, 2^140138891 is an apocalyptic number.

140138891 is a deficient number, since it is larger than the sum of its proper divisors (1).

140138891 is an equidigital number, since it uses as much as digits as its factorization.

140138891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 140138891 is about 11838.0273272197. The cubic root of 140138891 is about 519.4210655035.

The spelling of 140138891 in words is "one hundred forty million, one hundred thirty-eight thousand, eight hundred ninety-one".