1212447679 has 2 divisors, whose sum is σ = 1212447680. Its totient is φ = 1212447678.

The previous prime is 1212447661. The next prime is 1212447683. The reversal of 1212447679 is 9767442121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212447679 - 2²³ = 1204059071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212447619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606223839 + 606223840.

It is an arithmetic number, because the mean of its divisors is an integer number (606223840).

Almost surely, 2^1212447679 is an apocalyptic number.

1212447679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212447679 is an equidigital number, since it uses as much as digits as its factorization.

1212447679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 1212447679 is about 34820.2193990790. The cubic root of 1212447679 is about 1066.3202795953.

The spelling of 1212447679 in words is "one billion, two hundred twelve million, four hundred forty-seven thousand, six hundred seventy-nine".