1287420833 has 2 divisors, whose sum is σ = 1287420834. Its totient is φ = 1287420832.

The previous prime is 1287420803. The next prime is 1287420839. The reversal of 1287420833 is 3380247821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1283645584 + 3775249 = 35828^2 + 1943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287420833 - 2²⁴ = 1270643617 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 (1287420839) 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, 643710416 + 643710417.

It is an arithmetic number, because the mean of its divisors is an integer number (643710417).

Almost surely, 2^1287420833 is an apocalyptic number.

It is an amenable number.

1287420833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287420833 is an equidigital number, since it uses as much as digits as its factorization.

1287420833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 1287420833 is about 35880.6470538088. The cubic root of 1287420833 is about 1087.8612589022.

The spelling of 1287420833 in words is "one billion, two hundred eighty-seven million, four hundred twenty thousand, eight hundred thirty-three".