1320274649 has 2 divisors, whose sum is σ = 1320274650. Its totient is φ = 1320274648.

The previous prime is 1320274643. The next prime is 1320274693. The reversal of 1320274649 is 9464720231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194946624 + 125328025 = 34568^2 + 11195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320274649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1320274643) 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, 660137324 + 660137325.

It is an arithmetic number, because the mean of its divisors is an integer number (660137325).

Almost surely, 2^1320274649 is an apocalyptic number.

It is an amenable number.

1320274649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320274649 is an equidigital number, since it uses as much as digits as its factorization.

1320274649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 1320274649 is about 36335.5837850447. The cubic root of 1320274649 is about 1097.0373858486.

The spelling of 1320274649 in words is "one billion, three hundred twenty million, two hundred seventy-four thousand, six hundred forty-nine".