139021187 has 2 divisors, whose sum is σ = 139021188. Its totient is φ = 139021186.

The previous prime is 139021171. The next prime is 139021217. The reversal of 139021187 is 781120931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139021187 - 2⁴ = 139021171 is a prime.

It is not a weakly prime, because it can be changed into another prime (139021387) 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, 69510593 + 69510594.

It is an arithmetic number, because the mean of its divisors is an integer number (69510594).

Almost surely, 2^139021187 is an apocalyptic number.

139021187 is a deficient number, since it is larger than the sum of its proper divisors (1).

139021187 is an equidigital number, since it uses as much as digits as its factorization.

139021187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 139021187 is about 11790.7246172574. The cubic root of 139021187 is about 518.0364645400.

The spelling of 139021187 in words is "one hundred thirty-nine million, twenty-one thousand, one hundred eighty-seven".