1212312139 has 2 divisors, whose sum is σ = 1212312140. Its totient is φ = 1212312138.

The previous prime is 1212312113. The next prime is 1212312161. The reversal of 1212312139 is 9312132121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212312139 - 2¹⁷ = 1212181067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212312239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606156069 + 606156070.

It is an arithmetic number, because the mean of its divisors is an integer number (606156070).

Almost surely, 2^1212312139 is an apocalyptic number.

1212312139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212312139 is an equidigital number, since it uses as much as digits as its factorization.

1212312139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 25.

The square root of 1212312139 is about 34818.2730617129. The cubic root of 1212312139 is about 1066.2805433276.

The spelling of 1212312139 in words is "one billion, two hundred twelve million, three hundred twelve thousand, one hundred thirty-nine".