1288964609 has 2 divisors, whose sum is σ = 1288964610. Its totient is φ = 1288964608.

The previous prime is 1288964533. The next prime is 1288964627. The reversal of 1288964609 is 9064698821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721191025 + 567773584 = 26855^2 + 23828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288964609 is a prime.

It is a super-2 number, since 2×1288964609² = 3322859526509045762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1288964639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644482304 + 644482305.

It is an arithmetic number, because the mean of its divisors is an integer number (644482305).

Almost surely, 2^1288964609 is an apocalyptic number.

It is an amenable number.

1288964609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288964609 is an equidigital number, since it uses as much as digits as its factorization.

1288964609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 1288964609 is about 35902.1532641150. The cubic root of 1288964609 is about 1088.2959117191.

The spelling of 1288964609 in words is "one billion, two hundred eighty-eight million, nine hundred sixty-four thousand, six hundred nine".