1210123139 has 2 divisors, whose sum is σ = 1210123140. Its totient is φ = 1210123138.

The previous prime is 1210123097. The next prime is 1210123141. The reversal of 1210123139 is 9313210121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210123139 is a prime.

Together with 1210123141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1210123039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605061569 + 605061570.

It is an arithmetic number, because the mean of its divisors is an integer number (605061570).

Almost surely, 2^1210123139 is an apocalyptic number.

1210123139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210123139 is an equidigital number, since it uses as much as digits as its factorization.

1210123139 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 23.

The square root of 1210123139 is about 34786.8242154986. The cubic root of 1210123139 is about 1065.6383835277.

The spelling of 1210123139 in words is "one billion, two hundred ten million, one hundred twenty-three thousand, one hundred thirty-nine".