210139 has 2 divisors, whose sum is σ = 210140. Its totient is φ = 210138.

The previous prime is 210131. The next prime is 210143. The reversal of 210139 is 931012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210139 - 2³ = 210131 is a prime.

It is not a weakly prime, because it can be changed into another prime (210131) 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, 105069 + 105070.

It is an arithmetic number, because the mean of its divisors is an integer number (105070).

2²¹⁰¹³⁹ is an apocalyptic number.

210139 is a deficient number, since it is larger than the sum of its proper divisors (1).

210139 is an equidigital number, since it uses as much as digits as its factorization.

210139 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 16.

The square root of 210139 is about 458.4092058412. The cubic root of 210139 is about 59.4523310027.

The spelling of 210139 in words is "two hundred ten thousand, one hundred thirty-nine".