231210139 has 2 divisors, whose sum is σ = 231210140. Its totient is φ = 231210138.

The previous prime is 231210137. The next prime is 231210157. The reversal of 231210139 is 931012132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231210139 - 2¹ = 231210137 is a prime.

Together with 231210137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231210131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115605069 + 115605070.

It is an arithmetic number, because the mean of its divisors is an integer number (115605070).

Almost surely, 2^231210139 is an apocalyptic number.

231210139 is a deficient number, since it is larger than the sum of its proper divisors (1).

231210139 is an equidigital number, since it uses as much as digits as its factorization.

231210139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 231210139 is about 15205.5956476555. The cubic root of 231210139 is about 613.7652437510.

The spelling of 231210139 in words is "two hundred thirty-one million, two hundred ten thousand, one hundred thirty-nine".