1351229779 has 2 divisors, whose sum is σ = 1351229780. Its totient is φ = 1351229778.

The previous prime is 1351229777. The next prime is 1351229797. The reversal of 1351229779 is 9779221531.

Together with next prime (1351229797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (9779221531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1351229779 - 2¹ = 1351229777 is a prime.

Together with 1351229777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1351229777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675614889 + 675614890.

It is an arithmetic number, because the mean of its divisors is an integer number (675614890).

Almost surely, 2^1351229779 is an apocalyptic number.

1351229779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351229779 is an equidigital number, since it uses as much as digits as its factorization.

1351229779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 46.

The square root of 1351229779 is about 36759.0775047470. The cubic root of 1351229779 is about 1105.5449436345.

The spelling of 1351229779 in words is "one billion, three hundred fifty-one million, two hundred twenty-nine thousand, seven hundred seventy-nine".