1212316139 has 2 divisors, whose sum is σ = 1212316140. Its totient is φ = 1212316138.

The previous prime is 1212316123. The next prime is 1212316169. The reversal of 1212316139 is 9316132121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212316139 - 2⁴ = 1212316123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212316169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606158069 + 606158070.

It is an arithmetic number, because the mean of its divisors is an integer number (606158070).

Almost surely, 2^1212316139 is an apocalyptic number.

1212316139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212316139 is an equidigital number, since it uses as much as digits as its factorization.

1212316139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 1212316139 is about 34818.3305027682. The cubic root of 1212316139 is about 1066.2817160502.

The spelling of 1212316139 in words is "one billion, two hundred twelve million, three hundred sixteen thousand, one hundred thirty-nine".