1212124139 has 2 divisors, whose sum is σ = 1212124140. Its totient is φ = 1212124138.

The previous prime is 1212124073. The next prime is 1212124153. The reversal of 1212124139 is 9314212121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212124139 - 2⁸ = 1212123883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1212124159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606062069 + 606062070.

It is an arithmetic number, because the mean of its divisors is an integer number (606062070).

Almost surely, 2^1212124139 is an apocalyptic number.

1212124139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212124139 is an equidigital number, since it uses as much as digits as its factorization.

1212124139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 1212124139 is about 34815.5732252106. The cubic root of 1212124139 is about 1066.2254224560.

The spelling of 1212124139 in words is "one billion, two hundred twelve million, one hundred twenty-four thousand, one hundred thirty-nine".