1287490493 has 2 divisors, whose sum is σ = 1287490494. Its totient is φ = 1287490492.

The previous prime is 1287490489. The next prime is 1287490541. The reversal of 1287490493 is 3940947821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1282570969 + 4919524 = 35813^2 + 2218^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287490493 - 2² = 1287490489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287490423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643745246 + 643745247.

It is an arithmetic number, because the mean of its divisors is an integer number (643745247).

Almost surely, 2^1287490493 is an apocalyptic number.

It is an amenable number.

1287490493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287490493 is an equidigital number, since it uses as much as digits as its factorization.

1287490493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 1287490493 is about 35881.6177589584. The cubic root of 1287490493 is about 1087.8808792797.

The spelling of 1287490493 in words is "one billion, two hundred eighty-seven million, four hundred ninety thousand, four hundred ninety-three".