1320213787 has 2 divisors, whose sum is σ = 1320213788. Its totient is φ = 1320213786.

The previous prime is 1320213767. The next prime is 1320213847. The reversal of 1320213787 is 7873120231.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320213787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320213737) 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, 660106893 + 660106894.

It is an arithmetic number, because the mean of its divisors is an integer number (660106894).

Almost surely, 2^1320213787 is an apocalyptic number.

1320213787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320213787 is an equidigital number, since it uses as much as digits as its factorization.

1320213787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1320213787 is about 36334.7462768078. The cubic root of 1320213787 is about 1097.0205285189.

The spelling of 1320213787 in words is "one billion, three hundred twenty million, two hundred thirteen thousand, seven hundred eighty-seven".