1287759491 has 2 divisors, whose sum is σ = 1287759492. Its totient is φ = 1287759490.

The previous prime is 1287759479. The next prime is 1287759509. The reversal of 1287759491 is 1949577821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287759491 - 2¹⁸ = 1287497347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287759461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643879745 + 643879746.

It is an arithmetic number, because the mean of its divisors is an integer number (643879746).

Almost surely, 2^1287759491 is an apocalyptic number.

1287759491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287759491 is an equidigital number, since it uses as much as digits as its factorization.

1287759491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 53.

The square root of 1287759491 is about 35885.3659727750. The cubic root of 1287759491 is about 1087.9566383900.

The spelling of 1287759491 in words is "one billion, two hundred eighty-seven million, seven hundred fifty-nine thousand, four hundred ninety-one".