1287651017 has 2 divisors, whose sum is σ = 1287651018. Its totient is φ = 1287651016.

The previous prime is 1287650993. The next prime is 1287651049. The reversal of 1287651017 is 7101567821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656435641 + 631215376 = 25621^2 + 25124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287651017 - 2⁸ = 1287650761 is a prime.

It is a super-2 number, since 2×1287651017² = 3316090283162268578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1287651217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643825508 + 643825509.

It is an arithmetic number, because the mean of its divisors is an integer number (643825509).

Almost surely, 2^1287651017 is an apocalyptic number.

It is an amenable number.

1287651017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287651017 is an equidigital number, since it uses as much as digits as its factorization.

1287651017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 38.

The square root of 1287651017 is about 35883.8545449064. The cubic root of 1287651017 is about 1087.9260896416.

The spelling of 1287651017 in words is "one billion, two hundred eighty-seven million, six hundred fifty-one thousand, seventeen".