1921314779 has 2 divisors, whose sum is σ = 1921314780. Its totient is φ = 1921314778.

The previous prime is 1921314761. The next prime is 1921314797. The reversal of 1921314779 is 9774131291.

Together with next prime (1921314797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1921314761) and next prime (1921314797).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921314779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1921314709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960657389 + 960657390.

It is an arithmetic number, because the mean of its divisors is an integer number (960657390).

Almost surely, 2^1921314779 is an apocalyptic number.

1921314779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921314779 is an equidigital number, since it uses as much as digits as its factorization.

1921314779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 44.

The square root of 1921314779 is about 43832.8048269786. The cubic root of 1921314779 is about 1243.1766407069.

The spelling of 1921314779 in words is "one billion, nine hundred twenty-one million, three hundred fourteen thousand, seven hundred seventy-nine".