139021111 has 2 divisors, whose sum is σ = 139021112. Its totient is φ = 139021110.

The previous prime is 139021109. The next prime is 139021123. The reversal of 139021111 is 111120931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139021111 - 2¹ = 139021109 is a prime.

Together with 139021109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139021171) 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, 69510555 + 69510556.

It is an arithmetic number, because the mean of its divisors is an integer number (69510556).

Almost surely, 2^139021111 is an apocalyptic number.

139021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

139021111 is an equidigital number, since it uses as much as digits as its factorization.

139021111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 139021111 is about 11790.7213943847. The cubic root of 139021111 is about 518.0363701400.

The spelling of 139021111 in words is "one hundred thirty-nine million, twenty-one thousand, one hundred eleven".