1288762493 has 2 divisors, whose sum is σ = 1288762494. Its totient is φ = 1288762492.

The previous prime is 1288762459. The next prime is 1288762499. The reversal of 1288762493 is 3942678821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 831572569 + 457189924 = 28837^2 + 21382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288762493 - 2²² = 1284568189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288762499) 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, 644381246 + 644381247.

It is an arithmetic number, because the mean of its divisors is an integer number (644381247).

Almost surely, 2^1288762493 is an apocalyptic number.

It is an amenable number.

1288762493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288762493 is an equidigital number, since it uses as much as digits as its factorization.

1288762493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 1288762493 is about 35899.3383365209. The cubic root of 1288762493 is about 1088.2390253590.

The spelling of 1288762493 in words is "one billion, two hundred eighty-eight million, seven hundred sixty-two thousand, four hundred ninety-three".