1287075641 has 2 divisors, whose sum is σ = 1287075642. Its totient is φ = 1287075640.

The previous prime is 1287075631. The next prime is 1287075667. The reversal of 1287075641 is 1465707821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1074528400 + 212547241 = 32780^2 + 14579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287075641 - 2¹⁰ = 1287074617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287075631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643537820 + 643537821.

It is an arithmetic number, because the mean of its divisors is an integer number (643537821).

Almost surely, 2^1287075641 is an apocalyptic number.

It is an amenable number.

1287075641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287075641 is an equidigital number, since it uses as much as digits as its factorization.

1287075641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1287075641 is about 35875.8364501791. The cubic root of 1287075641 is about 1087.7640219662.

The spelling of 1287075641 in words is "one billion, two hundred eighty-seven million, seventy-five thousand, six hundred forty-one".