139871111 has 2 divisors, whose sum is σ = 139871112. Its totient is φ = 139871110.

The previous prime is 139871093. The next prime is 139871129. The reversal of 139871111 is 111178931.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (139871093) and next prime (139871129).

It is an emirp because it is prime and its reverse (111178931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139871111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139871311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69935555 + 69935556.

It is an arithmetic number, because the mean of its divisors is an integer number (69935556).

Almost surely, 2^139871111 is an apocalyptic number.

139871111 is a deficient number, since it is larger than the sum of its proper divisors (1).

139871111 is an equidigital number, since it uses as much as digits as its factorization.

139871111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 32.

The square root of 139871111 is about 11826.7117577119. The cubic root of 139871111 is about 519.0900147428.

The spelling of 139871111 in words is "one hundred thirty-nine million, eight hundred seventy-one thousand, one hundred eleven".